-
294 BCE
Eratosthenes
-Made first measurement of earth
-The starting point of future calculations
276-194 bce -
150
Claudius Ptolemy
-Starlight is refracted in the earths atmosphere
-Published observations so future discoveries could be made
-100-170 Ad -
1543
Nicolaus Copernicus
-Published Heliocentric model
-Day and night are a result of rotation
-1473-1543 -
1575
Tycho Brahe
-Proved earth centered model of the universe
-Proved planetary motion
-1546-1601 -
Johannes Kepler
-Three Laws that govern planetary motion
-Observed elliptical orbits
-1571-1630 -
Sir Issac Newton
-Formulated basic laws of motion
-Published work to prove Kepler
1642-1727 -
Albert Einstein
-Published theories of relativity
-Explained photoelectric effect
-1874-1955
