-
230 BCE
Eratosthenes
suggested the earth was round -
150
Claudius Ptolemy
suggested the earth was at the center of the universe -
1543
Nicolaus Copernicus
discovered the earth rotates on an axis -
Tycho brahe
suggested the sun orbited earth, other planets went around the sun -
Johnanes kepler
created the three laws of planetary motion;
(1)the planets move in elliptical orbits with the sun at a focus (2)in their orbits around the sun, the planets sweep out equal areas in equal times (3) the square of the times to complete one orbit are proportional to the cubes of the average distances from the sun -
sir issac newton
created the newton laws ( the motion of forces) -
albert einstein
predicted that the gravitational waves has something to do with beginning of the universe