Ancient Astronomers

  • 260 BCE

    Erathoshenes (276-195 BC) -

    Used the Sun to measure the size of the round Earth. He was only off by 211 miles
  • 150

    Claudius Ptolemy)AD 90 - 168 - Geocentric Theory

    States that Earth is the center of the Universe. It was important because astronomers have been able to use his model for other answers
  • 1514

    Nicolaus Copernicus (1473 - 1543) - The Heliocentric System

    Proposed a model of the solar system that involved the Earth revolving around the sun. Which changed the way scientist viewed the solar system. The Heliocentric SYtem
  • Tycho Brahe - (1546 - 1601) - Theory of the Solar System

    Created detailed mathematical tables - Rudolphen Tables. 1627
    Solar System - discovered that planets moved in elliptical orbits and his other laws which gave Newton the clues he needed to establish inverse-square gravitation.
  • Johannes Keplar - (1571 - 1630) - The Laws of Planetary Motion

    Determined that planets traveled around the Sun not in circles but in ellipses. He calculated the 3 laws involving the motion of planets that astronomers still use today.
  • Sir Isaac Newton - (1643-1727) - Theory of Gravity

    Calculated the 3 laws describing the motion of forces between objects. And theorized on the gravity theory.
  • Albert Einstein - (1879 - 1955) - Theory of Relativity

    Predicted extraordinary astronomical phenomena like stars and black holes