Timline A

By coronoides
  • Feb 1, 1543

    Heliocentric Theory of the Universe

    Copernicus publishes his heliocentric theory of the Universe in Poland, 1543.
  • Feb 1, 1572

    Cassiopeia Supernova

    Tycho Brahe discovers a supernova in constellation of Cassiopeia, in Denmark. Not that Casiopeia is in Denmark he discovered these things while in Denmark.

  • Galileo Uses the Telescope

    Galileo uses telescope for astronomical observations. Galileo didn't invent the telescope but he was among the first to use a telescope to examine the heavens. He carried out important observations of the Sun, Moon, Planets, and Stars.

  • Laws of Planetary Motions

    Kepler discovers laws of planetary motion. Working with Tycho's observations, Kepler discovers the shapes of planetary orbits, how the speed of a planet varies as it orbits the Sun, and the relationship between orbital distance and orbital period.

  • Martian Polar Ice Caps

    Cassini notes Martian polar ice caps in Italy, 1666.

  • Measuring the Distance of Stars

    James Gregory makes the first realistic estimate of the distances of the stars. Gregory assumed that the other stars were just as bright as the Sun and then calculated how distant they had to be to match their apparent brightnesses.

  • Publication of Philosophiae Naturalis Principia Mathematica

    Newton publishes his theory of universal gravitation in the work Philosophiae Naturalis Principia Mathematica. This is seen to be the start of Modern Astronomy. This happens in England.

  • Hubble Put into Orbit

    Hubble Space Telescope put into orbit from space shuttle Discovery. United States.

  • Galileo is Forgiven

    Pope John Paul II announces that the Catholic Church revokes its condemnation of Galileo.

  • Coment Hits Jupiter

    Comet Shoemaker Levy crashes into Jupiter.