The Astronomer years

  • 150

    Ptolemy's birth

    Ptolemy's birth
  • Period: 150 to 175

    Ptolemy's lifespan

    Claudius Ptolemy lived in Greece. He thought of the geocentric theory. This was wrong although his theory of the planets rotating and revolving was correct. He also wrote two books called Geographia and Almagest.
  • 175

    Ptolemy's death

    Ptolemy's death
  • Feb 19, 1473

    Copenicus's Birthday

    Copenicus's Birthday
  • Period: Feb 19, 1473 to May 24, 1543

    Copenicus's lifespan

    Nicolaus Copernicous was the first astronomrto have the idea of the heliocentric theory. He was Polish. He thought that the planets revolved in circles.
  • May 24, 1543

    Coprnicus's death

    Coprnicus's death
  • Feb 15, 1564

    Galileo's Birthday

    Galileo's Birthday
  • Period: Feb 15, 1564 to

    Galileo's lifespan

    Galileo Galilei was an Italian Astronomer who supported the heliocentric theory. He studied Venus's phases with his invention of the telescope. He also studied Jupiter's moons to show not everything revolved around the earth. He discovered inertia. His last discovery was that the light side of the moon was just a reflection of sunlight.
  • Dec 27, 1571

    Kepler's birthday

    Kepler's birthday
  • Period: Dec 27, 1571 to

    Kepler's life

    Johannes Kepler was a german mathmatition who supported the heliocentric theory. He studied brahe's data to find out how mars orbited. He found out that planets orbit in an ellipse or oval path. HE also discovered that the distance a planet is from the sun determans how fast it travels.
  • Kepler's death

    Kepler's death
  • Galileo's death

    Galileo's death
  • Newtons's birthday

    Newtons's birthday
  • Period: to

    Newton's lifespan

    Issac Newton was an English Astronomer who supported the heliocentric theory. He used gravity and inertia to find out how the planets stay in orbit.
  • Newton's death

    Newton's death