Ancient Astronomers time line

  • 240 BCE

    Eratosthenes is most famous for making the first good measurement of the size of Earth

  • 150

    Ptolemy first major astronomical work the Almagest was completed

  • 1543

    Copernicus publishes his major astronomical work 'Six Books Concerning the Revolutions of the Heavenly Orbs,'

  • 1572

    Brahe made the observations of a supernova

  • Kepler made the famous Keplerian telescope

  • Newton developed his theories of gravitation

  • Einstein created the Theory of General Relatively