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made the first measurement of the size of Earth for which any details are known.
so we know how big the earth is -
He posited that the Moon, Mercury, Venus, and the Sun all revolved around Earth. how everything works
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Earth and other planets revolve around the sun, or the Heliocentric Theory of the universe. we know how everything happens
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made accurate observations of the stars and planets
1572
so we can learn about stars -
the Earth and planets travel about the sun in elliptical orbits.
we understand how the universe works -
developed the three laws of motion how everything moves around
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Begins publications on the general theory of relativity how everything works