History of Astronomy

By peyt.h
  • 350 BCE

    350 BC

    Aristotle discovered that the earth was round.
  • 230 BCE

    Aristarchus

    Presented the first known model depicting the sun being in the middle.
  • 168 BCE

    Geocentric Model

    The geocentric model was created by Ptolemy. It is the idea that the earth is the enter of the universe.
  • 6 BCE

    Christianity began

  • 1543

    Heliocentric model

    Copernicus created the heliocentric model, which is the idea that planets revolve around the sun.
  • 1543

    Copernican system

  • 1560

    Brahe helps push for geocentric ideas

    Helped overturn the idea of the sun being at the center of the solar system.
  • 1582

    Pope Gregory XIII introduces the Gregorian calendar.

  • Parallax

  • Kepler discovers ellipse

  • Johann Bayer introduces Bayer designation of stars, assigning Greek letters to stars, still in use today.

  • Hans Lippershey, a Dutch spectacles maker invents the telescope.

  • Kapler

    Kapler discovered 3 major laws of planetary motion.

  • The first reflecting telescope was built by Newton.

  • While in Paris, Danish astronomer Ole Romer measures the speed of light.