Ancient Astronomers

By dwhelan
  • 194 BCE

    Eratosthenes solves the circumference of the earth

    This is the first accurate measurement of our planet
  • 85

    Claudius Ptolemy proposed that earth was at the center of the universe

    This allowed for Greek astronomers to make accurate predictions about positions of planets
  • 1500

    Nicolaus Copernicus discovered that the Sun was at the center of our solar system

    This allowed astronomers to further understand how our solar system functions
  • 1572

    Tycho Brahe made the astronomical observations that led to Kepler

    Without Tycho Brahe Kepler wouldn't have had the information to make the laws about planetary motion.

  • Johannes Kepler came up with the three laws of planetary motion

    Revolutionizing how we think about planets and letting us infer more about planets than ever before

  • Sir Isaac Newton established the Law of Universal Gravitation

    This changed the way we thought about our planets and gave us a greater understanding about how the solar system is based around our sun

  • Albert Einstein theory of relativity

    Completely unprecedented theory that stated that time moves at different speeds depending where you are in space.