planetary Motion timeline

By emilyjkoop
  • Period: Jan 1, 1000 to

    Planitary Motion

    the first date is actuly 1000 bc
  • Dec 19, 1400

    classing of stars by Hipparachus

    he would class them base off of thier brightness
  • May 1, 1500

    seasons

    summer is marked on june 21 because it is the longest day.
    winter is marked on December 21 because it is the shortest day.

  • Pyrimids

    Built by egyptions to alighn sertin stars

  • planets move at constent speed- Aristatle

  • Eratoshenes- caculated cercumfrence of the earth