A timeline created using h5p. The reference book used is Lev Tarasov – Basic Concepts of Quantum Mechanics.
history
Galileo’s Experiments on Accelerated Motion
A short account of Galileo’s description of his own experiment on accelerated motion — a short account of it, the apparatus he used and the results he got.
The first argument that Salviati proves is that in accelerated motion the change in velocity is in proportion to the time (𝑣 ∝ 𝑡) since the motion began, and not in proportion to the distance covered (𝑣 ∝ 𝑠) as is believed by Sargedo.
The first argument that Salviati proves is that in accelerated motion the change in velocity is in proportion to the time (𝑣 ∝ 𝑡) since the motion began, and not in proportion to the distance covered (𝑣 ∝ 𝑠) as is believed by Sargedo.
“But for one and the same body to fall eight feet and four feet in the same time is possible only in the case of instantaneous (discontinuous) motion; but observation shows us that the motion of a falling body occupies time, and less of it in covering a distance of four feet than of eight feet; therefore it is not true that its velocity increases in proportion to the space. (Salviati)
Also, he proves that the increase in proportion is not of simple doubling but larger. They agree upon a definition of uniformly accelerated motion,
“A motion is said to be equally or uniformly accelerated when, starting from rest, its momentum receives equal increments in equal times. (Sargedo)
To this definition Salviati adds an assumption about inclined planes, this assumption is that for a given body, the increase in speed while moving down the planes of difference inclinations is equal to the height of the plane. This also includes the case if the body is dropped vertically down, it will still gain the same speed at end of the fall as it would gain from rolling on the incline This assumption makes the final speed independent on the profile of the incline. For example, in the figure below, the body falling along𝐶 → 𝐵, 𝐶 → 𝐷 and 𝐶 → 𝐴 will attain the same final speed.
This result is also proved via a thought experiment (though it might be feasible to do this experiment) for a pendulum. The pendulum rises to the height it was released from and not more.
After stating this theorem, Galileo then suggests the experimental verification of the theorem. of The actual apparatus that Galileo uses is an wooden inclined slope of following dimensions: length 12 cubits (≈ 5.5 m, 1 cubit ≈ 45.7 cm), width half-cubit and three-finger breadths thick . In this plank of wood, he creates a very smooth groove which is about a finger thick. (What was the thickness of Galileo’s fingers?) The incline of this plank are changed by lifting one end. A bronze ball is rolled in this groove and time taken for descent is noted.
“We repeated this experiment more than once in order to measure the time with an accuracy such that the deviation between two observations never exceeded one- tenth of a pulse-beat.
Then Galileo performed variations in the experiment by letting the ball go different lengths (not full) of the incline and “found that the spaces traversed were to each other as the squares of the times, and this was true for all inclinations of the plane”. Each variation was repeated hundreds of times so as to rule out any errors. Also, the fact that for different inclines the times of descent were in noted and were in agreement with the predictions.
Since there were no second resolution clocks to measure time, Galileo devised a method to measure time using water. This was not new, water clocks were used earlier also.
The basic idea was to the measure the amount of water that was collected from the start of the motion to its end. The water thus collected was weighed on a good balance.This weight of water was used as a measure of the time. A sort of calibration without actually measuring the quantity itself: “the differences and ratios of these weights gave us the differences and ratios of the times”
Galileo used a long incline, so that he could measure the time of descent with device he had. If a shorted incline was used, it would have been difficult to measure the shorter interval of time with the resolution he had. Measuring the free fall directly was next to impossible with the technology he had. Thus the extrapolation to the free fall was made continuing the pattern that was observed for the “diluted” gravity.
“You present these recondite matters with too much evidence and ease; this great facility makes them less appreciated than they would be had they been presented in a more abstruse manner. For, in my opinion, people esteem more lightly that knowledge which they acquire with so little labor than that acquired through long and obscure discussion. (Sargedo)
Reference
Dialogues Concerning Two New Sciences
An account of Nagpur state from 1790
This is an interesting account of Nagpur state from late eighteenth century. It is part of a small book titled Journal Of A Route To Nagpore by Daniel Robinson Leckie. I have taken some liberty to replace the long s typeset as f with regular s. For example, coft is cost. Some of the names are in archaic English but one can make sense of the them. For example Peshwa is Paishwah. This account shows the extent of the Rajah of Nagpore’s territories as well as some peculiarities of the region. Some of the places that are mentioned are the fortifications, palace, Jumma Talao, Sakkardarah etc. The account also has a short, somewhat incorrect, history of the house of the Bhoslas. Leckie says the Nagpur Bhoslas were descended from Shivaji’s house which clearly was not the case. Also there are remarks on the current affairs of the Nagpur state with the Peshwa in Pune and Chatrapati in Satara.
ACCOUNT OF NAGPORE,
&c. &c.
NAGPORE, situated in 79º 46′ east longitude from Greenwich, and 21º 49′ north latitude, is the present capital of Gondwauna1, a name little known to Europeans, perhaps owing to the remote situation of it from our settlements, and the Rauj2 of that name having been dismembered before we possessed any territory in India, at which time the comparatively confined state of the affairs of the Company did not lead to geographical inquiries.
I have taken no small degree of pains to ascertain the boundaries of Gondwauna; and though I will not pretend to say that the information I have procured is in every respect: exact, yet it may serve to give a general idea of the extent of the country.
It is not amiss to observe, that the people of this place are by no means communicative, and very circumspedt in giving information, particularly to Europeans, and it has cost me no small degree of trouble to collect what trifling information this account contains.
Gondwauna is bounded on the north-east; by an imaginary line, drawn from the town of Belhare to the city of Ruttunpoor; on the south-east by such another imaginary line, drawn from Ruttunpoor through the village of Soormul (situated about five coss to the north-east of Nurrah, which last is laid down in the map), to the junction of the Oordah and Beingunga rivers; on the south-wedt by the Oordah (Wadha) river; and pn the north-east by that chain of mountains which separates it from Malwa.
When Gondwauna was partly reduced by Aulumgwer, he obliged a great number of the natives together with the Rajah, to embrace the Mahomedan religion ; and the country remained for a series of years in this situation, the Rajah paying a fort of homage to the Moghul, as lord paramount : when, in the beginning of the present century, Ragojee Bhooshla, descended from the great Sevagi, reduced the greatest part of Gondwauna, to the south of the Nurbudda, with the province of Berar. The lenity with which he treated the Gonde Rajah deserves particular mention, as it shows a trait of humanity in the Merhattahs worthy of the highest pitch of civilization. He not only abstained from all forts of personal violence, but allotted three lachs of rupees annually for the Gonde Rajah’s maintenance, and the fort for him to live in, by no means as a confinement. Burhaun Shah, the son of the conquered Rajah, has still handsome allowances, and the fort to live in ; and the confidence which the late Moodajee placed in him was great: for what could be a greater mark of it in the East, than putting his family and women under his charge when he went upon any warlike expedition? which he constantly did.
Ragojee was the founder of Nagpore, which he surrounded with a rampart, it being only an insignificant village appertaining to the fort prior to his capture of it. It is situated oh a high plain, is richly cultivated, and produces fine wheat, and bounded by hills to the north- west and south. The Nag Nudde, a rivulet running to the southward, gives name to the town.
The houses are generally meanly built and covered with tiles, and the streets are narrow and filthy. The only good building is the palace, begun by the late Moodajee, and now finishing by his fon, the present Rajah ; it is built of a blue done dug out of a quarry in large blocks on the western skirts of the town. The present Rajah, however, has destroyed the grand effect which would have been produced by the stone alone, by intermixing brick-work in the building. There is a very large and deep3 tank near the west gate, called Jumma Tallow, three sides of which are handsomely built up with masonry ; and the Rajah has a foundery to the southward of the town, called Shukerderri, where he calls tolerably good brass guns. There, with some few gardens of the Rajah’s, neatly laid out in walks planted with cypress-trees, and interspersed with fountains, are the only places of note at Nagpore.
It should appear that Major Rennell (Memoir, second edition, 4to. page 12) is not perfectly clear with regard to the idea he has formed of the Merhattah state, that all the chiefs owe a fort of obedience to the Paishwah, resembling that of the German Princes to the Emperor. The account I heard from the Dewaun4 in the Durbar5 was,
But the fine extensive country which the Paishwah occupies, together with the advantage of playing the Sattarah puppet, will always give him influence with the other chiefs.
“That there is a person whom they call the representative of the Rauj, who is kept in the fort of Sattarah, and he is treated with all imaginable respect when he makes his appearance at Poonah, which is only upon particular occassions ; and when at Sattarah he is supplied with every luxury, and magnificently attended. On the demise of this image of government the handsome son of some poor man is chosen to supply his room. The Paishwah is prime minister to the Merhattah state; the Rajah of Nagpore, &c. commander in chief of the armies ; and they, as well as the rest of the chiefs, call themselves. servants of the Rauj; and none acknowledges the least immediate authority of the Paishwah, but they are all bound in cafes of necessity to render mutual assistance to each other, for the public good of the constitution.’’
The present Rajah, Rogojee Bhooshla, the grandson of the Conqueror (Ragojee the first was succeeded by his eldest son, Jannojee who was succeeded by his brother Sabage, who was slain in battle by Moodajee, the father of the. present Rajah. I have not the particulars their histories) does not seem to be either adapted to civil or military business ; he is generally dressed plainly in white, but wears costly diamonds and pearls; his behaviour is courteous to strangers. His great penchant is for elephants and mares. He has about 200 of the former, the finest; I ever beheld; and they are fed so sumptuously with sugar-cane, treacle, ghee, &c.. and not unfrequently fowl pallow, that they become almost mad with lust, breaking their chains and doing great mischief, which is considered by the Merhattahs as fine sport. The principal people about the Rajah are, his brother, Munnea Bapoo, a very quiet young man; Bhowaunny Caulloo, the Dewaun, a shrewd old fellow, and his nephew, Pondrang, the commander and paymaster of the army; Siree Dhur, the Monshee; and Mahadajee Leshkery, the Rajah’s confident, who is consulted on all occasions.
The Rajah does not keep up above 10,000 horse, the pay of which, as is the custom among all native princes, is irregularly distributed. He has two battalions of Sepoys, armed and clothed like ours ; and although they have been drilled by black officers, formerly belonging either to the Nabob of Lucknow, or our service, yet they go through their exercise very badly, and I do not think they will be able to make a stand against any body of native Sepoys disciplined by European officers.
I have heard that the total collections of the Rajah’s dominions, including Ruttunpore and Cuttae, only amount to seventy lacks of rupees per annum. I will not, however, pretend to affirm that this is exact though I do not think it can much exceed that sum; for the Rajah’s country, notwithstanding the great extent of it, does not contain a proportionable quantity of cultivated land to that which is waste and occupied by forests.
It is generally supposed that Nagpore is the capital of Berar. This is evidently a mistake. The inhabitants of Nagpore talk relatively of Berar as an adjoining province, as we do of Bahar to Bengal; and it has been shown that Nagpore is a city of late date. Elichpour is the capital of Berar, by the accounts I have received from the natives, who represent it as a very ancient city, and much larger than Nagpore.
A custom prevails in this town, which I cannot forbear taking notice of, because it serves to prove that long usage will give a plausibility to things seemingly the most preposterous. The bramins and best people at Nagpore have women attendants upon their families, whom they breed up from their childhood, and are called Butkies, or Slauls. They attend on their masters and mistresses during the day-time, and are permitted to go to any man they please in the night; some of them become very rich, and they are in general very handsome, fine women.
Nagpore,
August 20, 1790.
(Daniel Robinson Leckie)
1The three ancient capitals of Gondwauna were Gurry Mudlah, Gurry *****, and Deogur.
2The dominion of a Raujah is called a Rauj, that of a King is denominated a kingdom.
3Pond
4Minister
5Court
Book Review: Ages in Chaos by Stephen Baxter
Ages in Chaos is a scientific biography of James Hutton by Stephen Baxter. Hutton was a Scottish scientist who also played his part in Scottish enlightenment. Hutton was the first to speculate on the idea deep time required for geological processes at the end of 1700s arguing with evidence he collected. He was trained as a medical doctor, practiced farming for 10 odd years and had continued his explorations of geology throughout. The prevalent theories of geology, called Neptunists, posited that water was the change agent. Hutton on the other hand posited that it was heat which was responsible for changes, hence Vulcanists. Also, another thing was that of time needed for this change. As others of his era, Hutton was deeply religious, like Newton, wanted to find evidence for creation as per bible.
During his time, especially popular was the idea of flood as per Bible, while the Earth was literally considered to be 6000 years old. This created a problem for Hutton, who was labelled to be atheist and heretic for suggesting that Earth is much older and that there was no design. But Hutton was a conformist and wanted to find a uniform evidence for all observable aspects. He was not like a modern scientist, as he is painted many times. The ideas were vehemently attacked on each point. Though he went to the field to find geological examples for this theory. James Watt, Black and John Playfair were his friends and provided him with evidence in the form of rock samples. During his lifetime, Hutton’s ideas will not find much audience. But due to his friends, his ideas sustained a a barrage of criticisms. Only in the next generation with Lyell this work would find acceptance. This idea of a deep time was crucial in formation Darwin’s theory.
https://www.goodreads.com/book/show/157978.Ages_in_Chaos
The book reads well mostly, but at times a complete lack of illustrations in the forms of geological artefacats and maps (of Scotland) makes it difficult to read well.
Book Review: Pendulum: Léon Foucault and the Triumph of Science by Amir D. Aczel
The book traces Leon Foucault’s ingenious approach to solving the problem of providing a terrestrial proof of rotation of the Earth. The pendulum he devised oscillates in a constant plane, and if properly engineered (as he did) can actually show the rotation of the Earth. The demonstration is one the most visually impressive scientific experiments. Also, Foucault gave prediction, an equation which would tell us how the pendulum will behave at different parts of the Earth. The pure mathematicians and physicists alike were taken aback at this simple yet powerful demonstration of the proof which eluded some of the most brilliant minds, which includes likes of Galileo and Newton. Rushed mathematical proofs were generated, some of the mathematicians earlier had claimed that no such movement was possible. That being said, Foucault was seen as an outsider by the elite French Academy due to his lack of training and degree. Yet he was good in designign things and making connections to science. This was presented to the public in 1851, and the very next year in 1852 he created another proof for rotation of the Earth. This was done by him inventing the gyroscope.. Gyroscope now plays immense role in navigation and other technologies. Yet he was denied membership to the Academy, only due to interest of the Emperor Napolean III in his work in 1864. The pendulum is his most famous work, but other works are also of fundamental significance.
- He was first person to do photomicrography using Daguerreotype
- Accurate measurment of speed of light using rotating mirrors –
- Devised carbon arc electric lamp for lighting of micrcoscope
- One of the first to Daguerreotype the Sun
- Designed the tracking systems used in telescopes
- also designed many motors, regulators to control electrical devices
There are a couple of places in the book where Aczel seems to be confused, at one point he states parallax as a proof for rotation of Earth around its axis, whearas it is more of a proof of Earths motion around the Sun. At another place he states that steel was invented in 1800s which perhaps he means to say that it was introduced in the west at the time. Apart from this the parallels between the rise of Napoleon III, a Nephew of Napolean, to form the second Empire in France and Foucault’s own struggle for recognition of his work and worth is brought out nicely.
Review of Laal Kaptaan
Recently I saw the movie Laal Kaptaan (लाल कप्तान, literal translation Red Captain). Though I had seen the trailer when it was released sometime back this year, I did not see the movie. The visuals in the trailer were quite good, so I decided to finally watch it. And I was not disappointed. This is one of the few movies in recent times that I have managed to see in one shot. Or rather the movie managed to make me do it.
The major part of the movie is set in the region of Bundelkhand (literally the dominion of the Bundelas). This region which falls South-East of Agra and Delhi has historical places like Jhansi, Gwalior, Panna, Chhatarpur, Banda and Orchha within its folds has been historically important. The province of Awadh (Oudh) lies to the east of Bundelkhand and Ganges marks the boundary to the East, while the Rajputana lies to the West. The Yamuna divides the region into two, with the majority of the part lying to the West of Yamuna. The region between the two mighty rivers is known as a doab (marked yellow in the map below). Many of these were erstwhile princely states, which also existed until 1947, when they were merged with the Indian republic.
The era when the Mughal empire was disintegrating post the death of Aurangazeb in 1707, was especially tumultuous for this region. With the power vacuum created by the decaying Mughal empire being filled by the Marathas, by this time the Chatrapati was only a titular head and real power rested with the Peshwas and the various great houses of the Marathas (Shinde, Holkar, Bhosle, Gaikwad). The Marathas laid waste to large tracts and levied chauth ( collection of one-fourth of income ) on these regions mercilessly. But in general, they were hated in this region for their bullishness and general havoc they perpetrated on the public and places. For example, they looted the Red Fort in Delhi with impunity, scrapping off precious and semi-precious stones from the Diwan-e-Khaas to do a vasuli. (I might make a dedicated post for this later.)
If the Battle of Plassey (1757) was the founding stone of the British in India, then the battle of Buxar (1764) was the first real fortification of this foundation, and the British really established themselves in India as a potent force. Though the Marathas were the most powerful, the British did not engage with them directly until the end of the century. The third Battle of Panipat (1761), a few years before the battle of Buxar limited the Maratha presence in the North severely and was one of the major reasons that led to its full demise as a political and military power by the start of the next century. Though, this enabled the houses of Shinde, Holkar, Bhosle and Gaikwad to establish their own semi-independence over the Peshwas. Eventually, everyone became under the British. But the time in which the movie is set, the Marathas were still a force to reckon with and the EIC has just established itself as a millitary and political power in much of the region from Bengal to North India along the Gangetic plains.
The movie starts just after the Battle of Buxar (1764) when a large number of people are hanged outside the fortress of Shergarh (most probably a fictional place, as I could not find it anywhere in the sources). after the British win the battle. One of the persons who sides with the British named Rehmat Khan is especially despised upon, with him being called a gaddar (traitor) by the hanged. The accused are hanged on a huge banyan tree, with their bodies hanging like overgrown fruits along its branches. It is raining and in this scene, a young teenage boy promises Rehmat Khan that one day he will also hang on the same tree.
Fast forward 25 years (1789), we are taken to the den of a dacoit (डकैत /डाकू ) where the Bairagi called by another generic name Gossain (this term I had not heard before this film). He comes in and asks for fire for his chillam. Mayhem ensues and the hunter takes his prey. The entire scene starts with dark of the night and ends in the early morning.
The horde of warrior ascetics (of which were the Gossain/Naga) came to prominence in the resulting political instability and shifting sands post the fall of the Mughal empire.
…these orders became politically significant only after the collapse of the Mughal Empire, and more particularly after British activities created political and economic chaos in the second half of the eighteenth century.
Going forward, the hunter goes on to take his reward, where the local chieftain mocks him and doesn’t want to pay. He is made to pay by the Gossain. The film then follows the Gossain on his quest to locate and kill Rehmat Khan. Though there are hints that there is a link between the Gossain and the teenage boy who is hanged in the beginning, we are not sure how they are connected. I won’t go into the plot of the film, but will instead focus on some of the characters and background of the film.
Though some of the other reviews have portrayed the character of Rehmat Khan (played by Manav Vij) as just grunting. But I think he played the role very well, perhaps these reviewers are used to seeing villains as people who yell and show a lot of emosions on their faces. He subtly played the act of a cold-blooded, calculating and cruel character quite well and was never out of character. Rehmat Khan is a Rohilla. Now, the Rohillas were of an Afghan ethnicity, and they sided against the Marathas (led by Najib ad-Dawlah) with Ahemdshah Abdali during the third battle of Panipat. The Marathas were very enraged by this and Mahadji Shinde did collect his revenge on them a few years in 1772 after Panipat by destroying Rohilkhand and scattering bones of Najib ad-Dawlah. After this defeat, the First Rohilla war happened in which the British siding with the Nawab of Oudh defeated the Rohillas and the state of Rampur of established. The second Rohilla war, in 1794, between British and the Rohillas ended their supremacy in the region. Now, the time between the two wars, there was lot of guerilla activity carried out by the Rohillas, which led them to be set as Nawabs of Rampur. Given all this chaos and uncertainty, there were no permanent alliances or allegiances. The main part of Laal Kaptaan (c. 1789) is set in this era for the Rohillas. So, Rehmat Khan, a prominent Rohilla, defecting over to British was noteworthy, but not out of the line.
Pindaris
Pindaris were not a tribe, but a military system of bandits of all races and religions. They fluctuated in numbers, being augumented from time to timeby military adventurer from every State, and frequently amounted to as many as 30,000 men.
Pindaris present an episode in history of India, which is quite extraordinary, though skimmed upon in the history texts. Here we are witnessing a rise of a band of people whose existence was based on terrorising and looting people in distant provinces. The Pindaris were roughly active in the last three decades of eighteenth century to the first two decades of nineteenth. Earlier they were under tutelage of Maratha cheiftains who used them as militias to wreck havoc on supply lines of the enemies and disrupt civilian peace. So them accompanying the Maratha camp is completely normal. The depiction of the Pindari lust for the loot (tum log lo khazana, mai chala lene zanana) is well done in the film. In fact, the comedy of errors that the bunch sent to hunt down Rehmat Khan is something to relish. The frustration of the little Maratha knight in being unable to control them is well worth seeing.
But as the Maratha power came to a decline, the Pindaris in the nineteenth century became a force of their own, without masters. They would raid far, and were viscious and cruel in their tactics to make people pay. There are reports that people even committed suicides when they came to know that a Pindari raid was imminent.
Another thing worth mentioning in the film is the settings in which the film is shot. The cinematography is par excellence, set amongst fantastic fort ruins. I cannot identify the actual locations used in the film, so any information on that would be welcome.
The other character in the film worth mentioning is the Dog Walker played by Deepak Dobriyal. He has a pair of very fine Mudhol hounds (also known as Caravan hounds) named Sukhiram and Dukhiram.
The character has no name in the film, but he finds people who are wanted for a price. That is how he makes his living. He refuses a horse mount saying it interferes with His character has many layers and he shares a special relationship with the Gossain, they respect each other. It was a treat to watch Dobriyal play this character with English hat and his greeting of:
Howde do…
The two female characters in the film, one played by Zoya and other by Heena are in their niche. Zoya as a courtesan who is neglected, while Heena playing the wife of a chieftain carries herself well. Their characters are in emotional turmoil with maternal love and the surrounding situation.
The clothing, the artefacts are all era-appropriate and so are the languages used. A lot of work must have gone in background research and it shows in the quality of the film. Kudos to the production team for that. Just that the look of Saif has a semblance to Depp’s Jack Sparrow, that could have been avoided.
Overall a very watchable film, if you have not, do watch it.
PS: A special ode to Saif Ali Khan.
In my personal opinion, Saif Ali Khan has really matured as an actor over the years and has earned my respect for it. You can’t really compare his role in Yeh Dillagi and lets say his depiction of Langda Tyagi in Omkara. It is as if you are watching two completely different actors. The variety of roles he has done in recent times, and with grace is just amazing. He has done roles which many of the mainstream actors would shy away from. Hope that we see his good form in the future also.
References
Lorenzen, D. (1978). Warrior Ascetics in Indian History. Journal of the American Oriental Society, 98(1), 61-75.
Rotating Earth: the proofs or significance of Leon Foucault’s pendulum – Part 1
In an earlier post, we had discussed proofs of the round shape of the Earth. This included some ancient and some modern proofs. There was, in general, a consensus that the shape of the Earth was spherical and not flat and the proofs were given since the time of ancient Greeks. Only in the middle ages, there seems to have been some doubt regarding the shape of the Earth. But amongst the learned people, there was never a doubt about the shape of the Earth. Counter-intuitive it may seem when you look at the near horizon, it is not that counter-intuitive. We can find direct proofs about it by looking around and observing keenly.
But the rotation of Earth proved to be a more difficult beast to tame and is highly counter-intuitive. Your daily experience does not tell you the Earth is rotating, rather intuition tells you that it is fixed and stationary. Though the idea of a moving Earth is not new, the general acceptance of the idea took a very long time. And even almost 350 years after Copernicus’ heliocentric model was accepted, a direct proof of Earth’s rotation was lacking. And this absence of definitive proof was not due to a lack of trying. Some of the greatest minds in science, mathematics and astronomy worked on this problem since Copernicus but were unable to solve it. This included likes of Galileo, Newton, Descartes, and host of incredibly talented mathematicians since the scientific revolution. Until Leon Foucaultin the mid-1800s provided not one but two direct proofs of the rotation of the Earth. In this series of posts, we will see how this happened.
When we say the movement of the Earth, we also have to distinguish between two motions that it has: first its motion about its orbit around the Sun, and second its rotational motion about its own axis. So what possible observational proofs or direct evidence will allow us to detect the two motions? In this post, we will explore how our ideas regarding these two motions of the Earth evolved over time and what type of proofs were given for and against it.
Even more, there was a simple geometrical fact directly opposed to the Earth’s annual motion around the Sun and there was nothing that could directly prove its diurnal rotation. (Mikhailov, 1975)
Let us consider the two components of Earth’s motion. The first is the movement around the Sun along the orbit. The simplest proof for this component of Earth’s motion is from the parallax that we can observe for distant stars. Parallax is the relative change in position of objects when they are viewed from different locations. The simplest example of this can be seen with our own eyes.
Straighten your hand, and hold your thumb out. Observe the thumb with both the eyes open. You will see your thumb at a specific location with respect to the background objects. Now close your left eye, and look at how the position of the thumb has changed with respect to the background objects. Now open the right eye, and close the left one. What we will see is a shift in the background of the thumb. This shift is related by simple geometry to the distance between our eyes, called the baseline in astronomical parlance. Thus even a distance of the order of a few centimetres causes parallax, then if it is assumed that Earth is moving around the Sun, it should definitely cause an observable parallax in the fixed stars. And this was precisely one of the major roadblock
Earth moving around an orbit raised mechanical objections that seemed even more serious in later ages; and it raised a great astronomical difficulty immediately. If the Earth moves in a vast orbit, the pattern of fixed stars should show parallax changes during the year. (Rogers, 1960)
The history of cosmic theories … may without exaggeration be called a history of collective obsessions and controlled schizophrenias.
– Arthur Koestler, The Sleepwalkers
Though it is widely believed that Copernicus was the first to suggest a moving Earth, it is not the case. One of the earliest proponents of the rotating Earth was a Greek philosopher named Aristarchus. One of the books by Heath on Aristarchus is indeed titled Copernicus of Antiquity (Aristarchus of Samos). A longer version of the book is Aristarchus of Samos: The Ancient Copernicus. In his model of the cosmos, Aristarchus imagined the Sun at the centre and the Earth and other planets revolving around it. At the time it was proposed, it was not received well. There were philosophical and scientific reasons for rejecting the model.
First, let us look at the philosophical reasons. In ancient Greek cosmology, there was a clear and insurmountable distinction between the celestial and the terrestrial. The celestial order and bodies were believed to be perfect, as opposed to the imperfect terrestrial. After watching and recording the uninterrupted waltz of the sky over many millennia, it was believed that the heavens were unchangeable and perfect. The observations revealed that there are two types of “stars”. First the so-called “fixed stars” do not change their positions relative to each other. That is to say, their angular separation remains the same. They move together as a group across the sky. Imagination coupled with a group of stars led to the conceiving of constellations. Different civilizations imagined different heroes, animals, objects in the sky. They formed stories about the constellations. These became entwined with cultures and their myths.
The second type of stars did change their positions with respect to other “fixed stars”. That is to say, they changed their angular distances with “fixed stars”. These stars, the planets, came to be called as “wandering stars” as opposed to the “fixed stars”.
Ancient Greeks called these lights πλάνητες ἀστέρες (planētes asteres, “wandering stars”) or simply πλανῆται (planētai, “wanderers”),from which today’s word “planet” was derived.
Planet
So how does one make sense of these observations? For the fixed stars, the solution is simple and elegant. One observes the set of stars rising from the east and setting to the west. And this set of stars changes across the year (which can be evidenced by changing seasons around us). And this change was found to be cyclical. Year after year, with observations spanning centuries, we found that the stars seem to be embedded on inside of a sphere, and this sphere rotates at a constant speed. This “model” explains the observed phenomena of fixed stars very well.
The unchanging nature of this cyclical process observed, as opposed to the chaotic nature on Earth, perhaps led to the idea that celestial phenomena are perfect. Also, the religious notion of associating the heavens with gods, perhaps added to them being perfect. So, in the case of perfect unchanging heavens, the speeds of celestial bodies, as evidenced by observing the celestial sphere consisting of “fixed stars” was also to be constant. And since celestial objects were considered as perfect, the two geometrical objects that were regarded as perfect the sphere and the circle were included in the scheme of heavens. To explain the observation of motion of stars through the sky, their rising from the east and setting to the west, it was hypothesized that the stars are embedded on the inside of a sphere, and this sphere rotates at a constant speed. We being fixed on the Earth, observe this rotating sphere as the rising and setting of stars. This model of the world works perfectly and formed the template for explaining the “wandering stars” also.
These two ideas, namely celestial objects placed on a circle/sphere rotating with constant speed, formed the philosophical basis of Greek cosmology which would dominate the Western world for nearly two thousand years. And why would one consider the Earth to be stationary? This is perhaps because the idea is highly counter-intuitive. All our experience tells us that the Earth is stationary. The metaphors that we use like rock-solid refer to an idea of immovable and rigid Earth. Even speculating about movement of Earth, there is no need for something that is so obviously not there. But as the history of science shows us, most of the scientific ideas, with a few exceptions, are highly counter-intuitive. And that the Earth seems to move and rotate is one of the most counter-intuitive thing that we experience in nature.
The celestial observations were correlated with happenings on the Earth. One could, for example, predict seasons as per the rising of certain stars, as was done by ancient Egyptians. Tables containing continuous observations of stars and planets covering several centuries were created and maintained by the Babylonian astronomers. It was this wealth of astronomical data, continuously covering several centuries, that became available to the ancient Greek astronomers as a result of Alexander’s conquest of Persia. Having such a wealth of data led to the formation of better theories, but with the two constraints of circles/spheres and constant speeds mentioned above.
With this background, next, we will consider the progress in these ideas.
A stabilised image of the Milky Way as seen from a moving Earth.
Why did not scientific revolution occur in India?
If one wonders why did not the scientific revolution happen in India some aspects of how knowledge was limited might have an implication. I present here a comparative study of conditions prevailing in the two societies, and how the presence of the printing press disrupted the traditional balance of knowledge and its sharing in the society. Unfortunately, in India, we have no counterpart to this event which could have lead to the spread of knowledge amongst the masses. Even if it were, the rigid caste system would have made it almost impossible for knowledge to be so freely transferred. In an era of a global village, we still feel strong repercussions of caste-based discrimination today.
Consider this about how knowledge was restricted to apprenticeship and was often lost in transition amongst the traditional Indian craftsmen.
The secret of perfection in art and crafts resided in individuals and was never widely publicized. Master-craftsmen trained their apprentices from a very tender age but they did not teach them the more subtle aspects of their craft. Neither did they write books revealing the secrets of their perfection. These points were revealed by the master-craftsman only towards the end of his life and only to a favoured apprentice. Their secrets often died with them. p. 211 (Rizvi - Wonder that Was India Part 2)
This was compounded by the fact that the profession that one could practice was decided by the caste one was born in. In addition to this, the mostly oral nature of the Hindu theology in Sanskrit and exclusive rights to Brahmins as custodians of this knowledge played a huge role in stifling any societal or scientific progress. The extant books (both theological and scientific, mathematical) were mostly in Sanskrit, which again restricted their readership. And as they were reproduced by hand the copies and access to them was limited. The mobility between castes was strictly forbidden. Thus we have both theological as well as scientific, mathematical and technological knowledge bound by tradition which was not available to the general public by its design. Any leakage of such a knowledge to people who were not intended to know it was met with severe punishments.
In contrast to this, consider the situation in Europe. The church did have an control over the knowledge that was taught in the universities. The Bible was in Latin, which can be seen as European counterpart of Sanskrit in terms of its functions and reach, and the Church held authority over its interpretation and usage. The impact of movable type on the spread of the Bible is well known. The translation of the Bible to publicly spoken languages and its subsequent spread to the general public is seen as a major event in the renaissance and subsequently that of the scientific revolution. This was only possible due to the struggle between Catholics and Protestants, again this did not have any counterpart in the Indian context. But as with any subversive technology the printing press did not only print the Bible. Soon, it was put to use to create materials for all types of readership.
First appearing around 1450 in the German city of Mainz, printing rapidly spread from Johann Gutenberg's original press throughout the German territories and northern Italy, most notably Venice. This establishment, during the second half of the century, of scores of print shops corresponds to two related features of European, especially Western European, society at that time. The first is the fairly high rate of literacy on which the market for books and pamphlets was based. The second is the quite sudden wide availability of a multitude oE philosophical and general intellectual options. Together, these two features created a situation in which knowledge for very many people was no longer so chained to the texts of the university curriculum. This was a new situation practically without parallel. p. 24 (Dear - Revolutionizing the Sciences)
This spread led to the creation of books in areas of knowledge where it was guarded or passed through apprenticeship.
In 1531 and 1532 there first appeared a group of small booklets,
known as Kunstbüchlein ("Iittle craft-books"), on a variety of
practical craft and technical subjects. These anonymous books were
produced from the shops of printers in a number of German cities,
and catered to what they revealed as an eager appetite for such
things not just among German craftsmen, but among literate people of
the middling sort in general. They broke the perceived monopoly of
the craft guilds over possession of such practical knowledge as made
up metallurgy, dyeing or other chemical recipes, pottery or any of
a multitude of potential household requisites. p. 26
(Dear - Revolutionizing the Sciences)
Though, as Dear rightly points in the next paragraph just having access to information of paper about a craft does not necessarily lead to practice as experts, it nonetheless helped to overcome a belief about the fact that knowledge indeed can be transferred in the form of books via the printing press.
In the coming century, the presence of the printing press helped the spread of knowledge to all parts of Europe in all subjects of inquiry. There is no parallel to this in the Indian context. Neither the technology (in the form of a printing press) nor the drive to spread the knowledge to the general masses was present in India. In this post, I have glossed over many details but I believe there were two main reasons for a scientific revolution to not happen in India are, first the connection of caste with profession and non-availability of a technology to spread knowledge to the general public. As a result, though earlier we had a better technology and scientific knowledge we did not have a Scientific Revolution. In the current era, with the connected devices, and also with caste not being a barrier to one’s profession, who knows we might be on the doorsteps of a revolution.
Hymn of Creation from Rig Veda
This wonderful Hymn of Creation one of the oldest surviving records of philosophic doubt in the history of the world, marks the development of a high stage of abstract thinking, and it is the work of a very great poet, whose vision of the mysterious chaos before creation, and of mighty ineffable forces working in the depths of the primaeval void, is portrayed with impressive economy of language.
“Then even nothingness was not, nor existence.
There was no air then, nor the heavens beyond it
What covered it? Where was it? In whose keeping?
Was there then cosmic water, in depths unfathomed?
“Then there were neither death nor immortality,
nor was there then the torch of night and day.
The One breathed windlessly and self-sustaining.
There was that One then, and there was no other.
“At first there was only darkness wrapped in darkness.
All this was only unillumined water.
That One which came to be, enclosed in nothing,
arose at last, bom of the power of heat.
“In the beginning desire descended on it
that was the primal seed, bom of the mind.
The sages who have searched their hearts with wisdom
know that which is is kin to that which is not.
“And they have stretched their cord across the void,
and know what was above, and what below.
Seminal powers made fertile mighty forces.
Below was strength, and over it was impulse,
“But, after all, who knows, and who can say
whence it all came, and how creation happened?
The gods themselves are later than creation,
so who knows truly whence it has arisen?
“Whence all creation had its origin,
he, whether he fashioned it or whether he did not,
he, who surveys it all from highest heaven,
he knows— or maybe even he does not know.
From – The Wonder That Was India – A. L. Basham
They Thought They Were Free
In this post we will look at some experiences that people in Germany had during the rise of Nazi Party. Overall the trend is that you make it almost impossible for anyone opposed to your thought as an outcast, and others just follow the herd. Many measures of the present incumbent have parallels to this. And especially the current drama of demonetization of high denomination currency notes.
“This separation of government from people, this widening of the gap, took place so gradually and so insensibly, each step disguised (perhaps not even intentionally) as a temporary emergency measure or associated with true patriotic allegiance or with real social purposes. And all the crises and reforms (real reforms, too) so occupied the people that they did not see the slow motion underneath, of the whole process of government growing remoter and remoter.”
They say that it was essential that it should have been kept secret, otherwise the point of exercise would have been futile. People of the country are asked to make sacrifices for the betterment of the country. Otherwise the country was in crisis. So we had to take emergency steps. What is happening in all this introduced chaos is the issues which need to go in public imagination are removed. These are issues which the government doesn’t want people to discuss, debate. Like a magician they are directing the public attention with gimmicks and shenanigans when their slight of hand remains invisible from public scrutiny.
In all these perception managing exercise the ever changing breaking news in our main-stream-media plays an ubiquitous role. They are supposed to be a pillar in the democratic process, but instead we find that they are malleable and play hand-maiden’s role for diverting and capturing public imagination. Most of the time this is in sync with what the incumbent government wants.
“The dictatorship, and the whole process of its coming into being, was above all diverting. It provided an excuse not to think for people who did not want to think anyway. I do not speak of your ‘little men,’ your baker and so on; I speak of my colleagues and myself, learned men, mind you. Most of us did not want to think about fundamental things and never had. There was no need to. Nazism gave us some dreadful, fundamental things to think about—we were decent people—and kept us so busy with continuous changes and ‘crises’ and so fascinated, yes, fascinated, by the machinations of the ‘national enemies,’ without and within, that we had no time to think about these dreadful things that were growing, little by little, all around us. Unconsciously, I suppose, we were grateful. Who wants to think?”
Thinking is also outsourced. Experts are called in, to provide excerpts from ideas too complex and too common for common citizens to comprehend. Each idea is digested in studios, what is generated is a pre-digested version of the ideas so that you don’t need to do it. You perhaps do not have time to do it. There are more relevant things than ruminating about rationalisations regarding political policies. And if at all you do question or think about these, one of the basic logical fallacy of ad hominem is employed. Shoot the messenger, we already have the message (or massage after McLuhan). Messenger is the mess-maker. Here in public imagination the questioner becomes the questioned. The questions are irrelevant, motive, history and ideological stance of the person asking the question is more important. Questioning policies and performance metamorphose from act of trying to understand to act of treason to undermine.
The perpetrator becomes predated. Overnight they are condemned to become public and hence national enemies. Any one who does not support becomes anti-national by default. To live here you have to live by our rules, otherwise you should go away. Who gave this authority to them? This is again questioned back, you must have something to hide, hence you are not supporting this. Then it captures public imagination, those questioning are enemies within. Dissent is treason.
And we have in form of Pakistan the “Other”. The national enemy without. When there is a dullness in the public imagination, raise the ante in form of the bogey man for all our troubles. Again here the pattern is well laid out.
“Uncertainty is a very important factor, and, instead of decreasing as time goes on, it grows. Outside, in the streets, in the general community, ‘everyone’ is happy. One hears no protest, and certainly sees none.
What might happen next, what event will break the news, tomorrow is unknown. Through surveys through debates it is brought to fore that “All is well.” If it is not well for you, the trouble is with you. All the problems are only for people who are enemies within. Those supporting, are the ones who are honest, happy and hardworking. Rest of you need to prove you allegiance, we already have by token sloganeering, literally and figuratively both.
“And you are an alarmist. You are saying that this must lead to this, and you can’t prove it. These are the beginnings, yes; but how do you know for sure when you don’t know the end, and how do you know, or even surmise, the end? On the one hand, your enemies, the law, the regime, the Party, intimidate you. On the other, your colleagues pooh-pooh you as pessimistic or even neurotic. You are left with your close friends, who are, naturally, people who have always thought as you have.”
If you think too much you become the pseudo-leftist-communist-atheist-liberal. Taking a stance against the establishment is an act of defiance against the country. The content of the stance is not important, questioning is. Your thought is against the wisdom of the entire society. The entire system acts against you. The system forces you to choose. AADHAR is a case in this category. All the arguments against are drowned in a sea of arguments which do not address the concerns raised. Look at the benefits for the poor they say, those who fall in line, are normal. It is only people like you living in ivory towers feel bad about it. Outside everyone is using it, and they are happy about it. The dubious and shady way in which it was legalised itself should have sent shudders, but rather it has evoked a lukewarm response. Those in power are so intoxicated that even supreme court ruling that it should not be mandatory is ignored left right and center. Each day incrementally small changes and notifications are provided. Each day it is becoming near impossible to live without it. This is already under the premise that it is needed. No one can question that. And if you do, they ask what is your problem? Why can’t you fall in line? Just accept it will you. People must have bank account and must have ID cards, who cares if it is not constitutionally mandated?
Now you live in a world of hate and fear, and the people who hate and fear do not even know it themselves; when everyone is transformed, no one is transformed.
But till we find out and till we realise the water is already boiling and we and our coming generation is already cooked.
They Thought They Were Free – Milton Mayer