Ancient Astronomers

By osallee
  • 500 BCE

    Eratosthenes

    Eratosthenes created longitude and latitude and made a map of world known today.
  • 150 BCE

    Claudius Ptolemy

    Claudius Ptolemy compiled a star catalog
  • 1543

    Nicolaus Copernicus

    Nicolaus proposed the heliocentric system. This has given astronomers now the idea that the planets are orbiting the sun.
  • 1572

    Tycho Brahe

    Brahe made very accurate discoveries about the stars and the planets. This was important because it helps modern day scientist understand more about our universe.

  • Johannes Kepler

    Kepler discovered that the planets move in an elliptical orbit with the sun as the main focus.

  • Sir Isaac Newton

    Sir Isaac Newton discovered the laws of gravity. This is obviously important because the whole universe depends on gravity.

  • Albert Einstein

    Einstein came up with E=mc^2. This states that energy and mass are the same thing but in two different forms.