Early Astronomic Discoveries

By connalmckenna
  • 240 BCE

    Eratostenes

    he calculated earth's circumference but was only off by 1%. this is significant because he was able to calculate how big the earth was and be extremely accurate that long ago
  • Period: 147 BCE to 150 BCE

    claudius ptolemy

    wrote the almagest which is one of the oldest books on math and astronomy, elaborated on the geocentric model.
  • Period: 147 to 150

    claudius ptolemy

    wrote the almagest which is one of the oldest books on math and astronomy, elaborated on the geocentric model.
  • 1532

    nicolaus copernicus

    proposed the heliocentric model for the first time
  • 1572

    tycho brahe

    discovered supernova, this proved that there were other celestial objects outside our solar system
  • Period: to

    johannes kepler

    wrote the three laws of planetary motion. it illustrated that all objects in space have mass and gravity and effect each other's orbits

  • isaac newton

    wrote the universal law of gravity

  • einstein

    wrote general theory of relativity and refined newton's law of gravity