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*The date of 350 BC would not fit within the time frame comfortably, so I decided to put here. * Aristotle's thory of the universe was; the earth is in the center of the universe, with all the other planets, including the sun, in orbit around it.
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This was in the 2nd centurary AD, which did not fit comfortably on the graph, so for the pleasure for you to look at I placed it here, please forgive the moving of this date.Ptolemy arranged Aristotle ideas by creating a system of circles/ epicycle Which dimenstrate the motions of the planets revolution around the earth. Ptolemy continued to add epicycles to explain the universe
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The Sun was in the center of the universe and the Earth and other planets orbited around it.
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This was when the famous apple that Newton saw fell, when walking through an orchard. He started to question gravity and the acceleration at which things fall.
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He proved the previous discorveries found by Keepler and Galileo were true. Any 2 objects in the universe give off a gravitational force on each other, due to there mass. He also wondered, due to an experiment with a cannon, how the forces would act on the moon and what keeps it from falling directly onto earth. He discovered that if you shot a cannon at ehe right speead, it should continue at that speed and travel parral to eath, without every reaching the ground.
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Newton publish the book Principia, which showed his hypothesis of the inverse-square law of universal gravitation.
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The first reliable measurement of G was made. Which was 6.754 10-11 newton-square meter per square kilogram. The gravitation equation was already given, yet the value of G was unknown until his measurements.
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Albert Einstein's theory of general relativity, which proposed that spacetime is curved by matter. Also that free-falling objects are moving along locally straight paths in curved spacetime. This general theory of relaivity approaches the concept of gravity as a distortion of the space time continum, rather than a force.
