Astronomy

By kaleigh.krakower
  • 140

    Ptolemy suggests theory

    Ptolemy suggests geocentric theory of the universe in famous work Mathematike Syntaxis.
  • Apr 29, 1054

    Chinese astronomers observe "guest star"

    Chinese astronomers observe supernova in Taurus.
  • Apr 29, 1120

    Construction of an observatory

    Construction began in 1120. This is possibly the first observatory built in Medieval Islam.
  • Apr 29, 1420

    Ulugh Beg had an observatory built at Samarkand in central Asia.

    The observatory was a 3-story building, but also contained instruments that were outdoors. Ulugh Beg's observatory produced astronomical tables that included a catalogue of over 1,000 stars.
  • Apr 29, 1543

    Copernicus publishes therory

    Copernicus publishes his heliocentric theory of the Universe.
  • Apr 29, 1572

    Tycho Brahe discovers a supernova

    Tycho Brahe discovers a supernova in constellation of Cassiopeia.

  • The first reflecting telescope was built

    It was built by Newton.

  • The discovery of Uranus

    The discovery of Uranus by Herschel

  • The beginning of spectral analysis of stars

    Sir William Huggins in England

  • The moons of Mars

    Asaph Hall discovers Phobos and Deimos, the moons of Mars.