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Period: 384 BCE to 322 BCE
Aristotle
He believed the Earth was a sphere. This is important because made it proves that the Earth is round and not flat which was the theory at that time. -
240 BCE
Eratosthenes
He devised a plan to estimate the circumference of the Earth. This was an important because at the time nobody knew how big the Earth was. -
Period: 100 to 170
Claudius Ptolemy
He discovered that starlight is refracted in the Earth's atmosphere and he also discovered the Earth centered universe model. This is important because this model was adopted for more than 1500 years and was not corrected -
Period: 1543 to 1543
Nicolaus Copernicus
He believed the Earth was a sphere. This is important because made it proves that the Earth is round and not flat which was the theory at that time. -
Period: 1546 to
Tycho Brahe
He achieved his goal of measuring to one minute of arc. This is important because he was able to confirm is own picture of the universe with out using a telescope. -
Period: 1571 to
Johannes Kepler
Using Brahe's observation, Kepler devised three laws that govern planetary motion. This is important because his three laws proved his theory that planets and other satellites moved in a elliptical orbit. -
Period: to
Sir Isaac Newton
He formulated the basic laws of motion. This was important because Newtons laws explained why Kepler's laws of planetary motion are true. -
Period: to
Albert Einstein
He publish is theory in 1916 known as the General Theory of Relativity. This is important because his theory lead to the prediction of phenomena like black holes, bending of light and wormholes.