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Eratosthenes' is most famous for his accurate measurement of the Earth. This is important because it shows the combination of math and physics in astronomy. -
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Ptolemy created a geocentric model of the solar system showing that Earth was at the center. This is important because it was the way the solar system was observed for hundreds of years. -
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Copernicus creates his heliocentric model of the solar system. This is important because it changed the theory from the Earth being the center to the Sun. -
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Brache discovered a new star. This is important because he used the next 15 years to create better instruments to better measure stars. -
Kepler released the first two of 3 laws of motion: that planets have elliptical orbits and they travel at different speeds throughout their orbits. This is important because it changed the view of orbits from circles to ellipticals. -
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Newton's 3 laws of motion are released. This is important because it built upon Kepler's laws and helped explain gravitational forces. -
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Einstein began working on general relativity. This is important because it helps us understand black holes.