-
90
Claudius Ptolemy
-Astronomer, mathematician
-A.D. 90-168
He set up a model of the solar system sun, stars, planets revolved around Earth. called the Ptolemaic system. He was wrong. -
276
Eratosthenes
-Noble, greek, mathematician, astronomer,and Georgrapher.
-He used the sun to measure the round Earth. He was only off 211 miles of the true measurement.
- 276 -195 A.D -
1473
Nicolaus Copernicus
-16th century Poland astronomer
-1473-1543
-Model of solar system Earth revolving around the Sun.
-He changed the way many scientists think. -
1571
Tycho Brahe
-Danish astronomer
-his observations were accurate to help Kepler discover elliptic orbits.
-He also helped Newton establish universal inverse square gravity.
-1571-1630
Together with Kepler -
1571
Johannes Kepler
-Danish astronomer
-He determined the planets traveled around the Sun and not in circles but in an ellipse.
-He calculated 3 laws involving motion of planets that are still used today.
-1571-1630 -
Sir Isaac Newton
-1643-1727
-English astronomer
-most famous for his work on forces / Gravity
-3 laws today are called Newtons Laws -
Albert Einsetein
-Theory of relativity
E=mc2
-1879-1955
-Most famous scientist.
-He proposed new ways of looking at the universe