Ancient Astronomers

By Gretchen Schneider
  • Period: 276 BCE to 194 BCE

    Eratosthenes

  • 240 BCE

    Earth's Circumference

    It is used for navigation http://www.math.wichita.edu/history/Men/eratosthenes.html#:~:text=Eratosthenes%20is%20also%20known%20for,250%2C000%20stadia%20(25%2C000%20miles).
  • Period: 104 to 1 CE

    Claudius Ptolemy

  • 150

    Geocentric system

    While his work was inaccurate and distorted, he influenced many other researches
  • Period: 1473 to 1543

    Nicolaus Copernicus

  • 1507

    Heliocentric Model

    He was able to figure out that everything actually orbited the Sun, explaining many of the problems and potholes the Geocentric couldn't
  • Period: 1546 to

    Tycho Brahe

  • Period: 1571 to

    Johannes Kepler

  • 1572

    Stars

    He cataloged over 1000 stars and proved that they were actual objects moving through space rather than part of Earth's atmosphere

  • Planetary Motion

    The set of laws that describe planet motion
  • Period: to

    Sir Isaac Newton

  • Gravity

    gravity helped explain the motion of the planets and Sun
  • Period: to

    Albert Einstein

  • Light Measurement

    Helped figure out how the maximum speed of light affects measurements of time and space