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240 BCE
Eratostenes
he calculated earth's circumference but was only off by 1%. this is significant because he was able to calculate how big the earth was and be extremely accurate that long ago -
Period: 147 BCE to 150 BCE
claudius ptolemy
wrote the almagest which is one of the oldest books on math and astronomy, elaborated on the geocentric model. -
Period: 147 to 150
claudius ptolemy
wrote the almagest which is one of the oldest books on math and astronomy, elaborated on the geocentric model. -
1532
nicolaus copernicus
proposed the heliocentric model for the first time -
1572
tycho brahe
discovered supernova, this proved that there were other celestial objects outside our solar system -
Period: to
johannes kepler
wrote the three laws of planetary motion. it illustrated that all objects in space have mass and gravity and effect each other's orbits -
isaac newton
wrote the universal law of gravity -
einstein
wrote general theory of relativity and refined newton's law of gravity