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Erathoshenes (276-195 BC) -
Used the Sun to measure the size of the round Earth. He was only off by 211 miles. -
Claudius Ptolemy)AD 90 - 168 - Geocentric Theory
States that Earth is the center of the Universe. It was important because astronomers have been able to use his model for other answers. -
Nicolaus Copernicus (1473 - 1543) - The Heliocentric System
Proposed a model of the solar system that involved the Earth revolving around the sun. Which changed the way scientists viewed the solar system. The Heliocentric system. -
Johannes Keplar - (1571 - 1630) - The Laws of Planetary Motion
Determined that planets traveled around the Sun not in circles but in ellipses. He calculated the 3 laws involving the motion of planets that astronomers still use today. -
Tycho Brahe - (1546 - 1601) - Theory of the Solar System
Created detailed mathematical tables - Rudolphen Tables. 1627
Solar System - discovered that planets moved in elliptical orbits and his other laws which gave Newton the clues he needed to establish inverse-square gravitation. -
Sir Isaac Newton - (1643-1727) - Theory of Gravity
Calculated the 3 laws describing the motion of forces between objects. And theorized on the gravity theory. -
Albert Einstein - (1879 - 1955) - Theory of Relativity
Predicted extraordinary astronomical phenomena like stars and black holes.