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100 BCE
Claudius Ptolemy
- Claudius Ptolemy discovered that the Moon, Mercury, Venus, and the Sun all revolved around Earth.
- He made his discovery around 141 B.C.
- This discovery is important because he synthesized Creek knowledge of the known Universe.
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276
Eratosthenes
- Eratosthenes discovered the tilt of the Earth's axis.
- He made this discovery in around 240 B.C.
- This discovery is important because his discover helped him make a map of the known world.
- He was born in 276 B.C.
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Feb 19, 1473
Nicolaus Copernicus
- He discovered that the sun was stationary in the center of the universe.
- He discovered this in 1514
- This discovery is important because it established that the planets orbited the sun rather than the earth.
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Dec 14, 1546
Tycho Brahe
- He discovered the geo-helicocentric model.
- The geo-helicocentric model occured in the 16th Century.
- This is important because it led to the advancement in astronomical tools.
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Sir Isaac Newton
- Sir Isaac Newton discovered that all objects in the Universe pulled on each other through gravity.
- He mad this discovery around 1665-1666.
- This is important because it led to more ways to solve mathamatic problems.
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Albert Einstein
- Albert Einstein discovered gravitational waves in space.
- He discovered this in 1916.
- This is important because it allows us to discover the universe in ways never thought possible.