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Period: 276 BCE to
through the years
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240 BCE
Eratosthenes
Eratosthenes used the sun to measure the size of the round earth. He was the first to recognize that the earth was a sphere and not flat. -
150
Claudius
Claudius Ptolemy wrote a book called the Almagest. This book defined astronomy for over 1,000 years. -
1532
Nicolaus Copernicus
Nicolaus Copernicus believed that the planets revolved around the sun instead of the planets and sun revolving around the Earth -
1563
Tycho Brahe
Tycho Brahe observed the study of the solar system -
Johannes Kepler
Johannes was a mathematics professor. He then published "Keplers laws" about the motions of the planets -
Isaac Newton
He used telescopes to prove his theory of light and color. -
Albert Einstein
He proposed a special theory of relativity in a paper he wrote in his paper " On the Electrodynamics of Moving Bodies"