Universe

Ancient Astronomers

  • Period: 276 BCE to 194 BCE

    Eratosthenes

    Born in Cyrenne and died in Alexandria
  • Eratosthenes
    240 BCE

    Eratosthenes

    1. 1st to calculate Earth's circumference. The Earth's circumference has been used to define fundamental units of measurement of length
    2. Calculated the distance between the Sun and the Earth. The distance between the Sun and the Earth helps determining the temperature on Earth
  • Period: 100 to 170

    Claudius Ptolemy

    Born in Egypt and died in Alexandria
  • Claudius Ptolemy
    140

    Claudius Ptolemy

    1. Created a star catalog that listed 48 constellations. This catalog showed the accurate measurements of the stars.
  • Period: Feb 19, 1473 to May 24, 1543

    Nicolaus Copernicus

    Born in Torun and died in Frombork
  • Nicolaus Copernicus
    1543

    Nicolaus Copernicus

    1. Created the Heliocentric system. This system puts the Sun at the center of our system. Copernicus is the 1st to bring this to the world.
  • Period: Dec 14, 1546 to

    Tycho Brahe

    Born in Denmark and died in Prague
  • Period: Dec 27, 1571 to

    Johannes Kepler

    Born and died in Germany
  • Tycho Brahe
    1572

    Tycho Brahe

    1. 1st to identify a Supvernova. The Supernova has the potential and power to either create, alter, or destroy life of the stars.
  • Johannes Kepler

    Johannes Kepler

    1. Created the 3 laws of planetary motion. This identified that the planets move in elliptical orbits with the Sun. Their orbits around the Sun.
  • Period: to

    Sir Issac Newton

    Born in Woolsthorpe, England and died in London, England
  • Sir Issac Newton

    Sir Issac Newton

    1. Created the theory of gravitation. This showed that gravity is the force that holds everything in the universe together.
    2. Created the laws of motion. This was the foundation of classic mechanics which was the main branches of physics.
  • Period: to

    Albert Einstein

    Born in Ulm, Germany and died in Princeton, NJ
  • Albert Einstein

    Albert Einstein

    1. Discovered the theory of relativity. This is the most important theories in physics and has a lot of significance in our lives.