P2 Jillian M.'s Timeline

By jillian.m
  • 200

    Ptolemy

    Ptolemy
    Time lived - 90 AD- 168 AD Geocentric model: Ptolemy thought that the Earth was the center of the universe and that everything revolved around it. His proof was that the sun, moon and stars move across our sky each day and the Earth was at rest.
  • Feb 19, 1473

    Nicholas Copernicus

    Nicholas Copernicus
    Time Lived: 1473 - 1543 Heliocentric model: Copernicus thought that the geocentric teory was incorrect. He said that the rising of the sun, moon, and stars are because of the fact that the Earth and all of the other planets orbit the sun.
  • Feb 15, 1564

    Galileo Galilei

    Galileo Galilei
    Time Lived: 1564 - 1642 Galileo explainedthat Ptolemy was wrong and the sun is the center of the unierse and we all revolve around it.
  • Dec 27, 1571

    Johannes Kepler

    Johannes Kepler
    Time Lived: 1571 - 1630 Elliptical orbits: Kepler discovered the heliocentric theory. He said it was true and that Ptolemy was wrong.

  • Sir Isaac Newton

    Sir Isaac Newton
    Time Lived: 1643 - 1727 Universal Law of Gravity and Inertia: Newton explained that an object in motion tends to stay in motion and an object at rest tends to stay at rest unless acted on by an outward un - balanced force. That is the Inertia theory. He discovered the law of gravity, which, in short, is what goes up must come down.