History of Astronomy

By livdtr
  • 322 BCE

    Aristotle

    Aristotle
    He was an ancient Greek philosopher and scientist. He believed that stars are perfect circles. He believed that earth was the center of the earth.
  • 168 BCE

    Ptolemy

    Ptolemy
    Believed that earth is the in the center of the universe. He said that the stars, planets, sun, and moon move together.
  • 1543

    Copernicus

    Copernicus
    He believed that the earth revolved around the sun,and that the earth spins on the suns axis once a day. This is called the Heliocentric, or sun-centered system.

  • Tycho Brahe

    Tycho Brahe
    Tycho was a danish astronomer. he measured and studied the positions of the stars. He discovered the star called "Cassiopeia"

  • Hans Lippershey

    Hans Lippershey
    He was a dutch inventor. He invented the telescope, and the microscope.

  • Johannes Kepler

    Johannes Kepler
    He was a German astronomer who discovered the three laws of planetary movement. these are the three laws he discovered: Law of orbit was when all the planets move elliptical orbits, with the sun at one point. The law of periods was the square of the period of any planet is equal to the orbit. The law of area is a line that connects a planet to the sun sweeps out equal areas at the same time.

  • Galileo

    Galileo
    Galileo was the first person to use the telescope. he found that the moon is smooth, and round just by looking at it.

  • Giovanni Cassini

    Giovanni Cassini
    He discovered saturn's moons.

  • Sir Isaac Newton

    Sir Isaac Newton
    He created a modernized telescope. Newton also helped develop spectral analysis. newton created the laws of gravitation and calculus.

  • William Herschel

    William Herschel
    William discovered a planets while using a telescope. he also discovered galaxy's while observing the sky's.

  • Percival Lowell

    Percival Lowell
    he discovered 793 Arizona. he also discovered that there was life on mars. he found that there is vast canals on mars.

  • Karl Jansky

    Karl Jansky
    He discovered radio waves emanating from the Milky Way.

  • Edwin Hubble

    Edwin Hubble
    He discovered that the galaxy's distance and that it's moving. He helped discover the idea of the universe. Hubble also discovered the Hubble law. The Hubble law is that astronomical objects in the universe travel away from each other.

  • Albert Einstein

    Albert Einstein
    Albert is known for many things. one being the theory of relativity. he also discovered the link between mass and energy, the theory of light, and the Brownian movement.

  • Sputnik

    Sputnik
    It was a spacecraft and it was the first artificial satellite placed orbit around the earth.

  • Yuri Gagarin

    Yuri Gagarin
    He was the first man in space. He is celebrated as a hero for the first man in space. He went after they launched a satellite (sputnik) and his mission began.

  • Ejnar Hertzsprung

    Ejnar Hertzsprung
    he found that each planet has its own color and brightness. he found the luminosity/brightness of each star.

  • The Apollo program

    The Apollo program
    It was designed to land 6 humans on the moon, and bring them safly back.

  • First Space Shuttle Flight

    First Space Shuttle Flight
    it took place April 12, 1981.

  • Mars Pathfinder Expedition

    Mars Pathfinder Expedition
    It was launched December 4, 1996 and landed on mars July 4, 1997. it was designed as a technology demonstration of a newer way to deliver a lander and robotic rover to mars.

  • Neil Armstrong

    Neil Armstrong
    He was a spacecraft commander, and the first man to walk on the moon.

  • John Glenn

    John Glenn
    He was the first American to orbit around earth. He was one of the Mercury 7 to go to space. His mission was the Mercury-Atlas 6.