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Period: 276 BCE to 195 BCE
Eratosthenes
Used the sun to calculate the circumference of the Earth -
Period: 90 to 168
Ptolemy
Created the geocentric view of the Universe (Earth is the center of it) -
Period: 1473 to 1543
Copernicus
Published the heliocentric model of the solar system in 1543; it totally changed the way scientists viewed the universe -
Period: 1546 to
Tyco Brahe
Believed in the geocentric model of the universe but provided very detailed info about planet orbits that were used by Kepler. -
Period: 1571 to
Johannes Kepler
Kepler's 3 laws (1609-1619; planet orbits are ellipses etc.) are still used by astronomers in calculations today -
Period: to
Isaac Newton
Published his 3 laws in 1687, describing the physics of moving objects due to the forces between them (gravity); works for large objects. -
Period: to
Albert Einstein
Published e=mc^2 in 1905; General Relativity in 1907-1915, which says that gravity between 2 objects is due to the warping of space-time>>used in gravitational lensing by astronomers today