Time Line of Astronomers from 1750 to 2010

  • Period: to

    Astronomer from 1750 to 2010

  • Immanuel Kant

    Immanuel Kant
    He first formulates the nebular hypothesis of solar system formation. This hypothesis is the most widely accepted model explaining the formation and evolution of the solar system.
  • Johann Palitzsch

    Johann Palitzsch
    Johann Palitzsch observes the return of Halley's comet. The interference of Jupiter's orbit had slowed the return by 618 days. Parisian astronomer La Caille suggests it should be named Halley's comet.
  • Johann Titius

    Johann Titius
    Johann Titius finds the Titius-Bode rule for planetary distances. The Titius–Bode law (sometimes termed just Bode's law) is a hypothesis that the bodies in some orbital systems, including the Sun's, orbit at semi-major axes in a function of planetary sequence. The hypothesis correctly predicted the orbits of Ceres and Uranus, but failed as a predictor of Neptune's orbit.
  • William Herschel

    William Herschel
    William Herschel discovers Uranus during a telescopic survey of the northern sky.
  • Pierre Laplace

    Pierre Laplace
    Pierre Laplace re-states the nebular hypothesis for the formation of the solar system.
  • Giuseppe Piazzi

    Giuseppe Piazzi
    Giuseppe Piazzi discovers the asteroid Ceres.
  • Heinrich Wilhelm Olbers

    Heinrich Wilhelm Olbers
    Heinrich Wilhelm Olbers discovers the asteroid Pallas.
  • Alexis Bouvard

    Alexis Bouvard
    Alexis Bouvard detects irregularities in the orbit of Uranus.
  • Christian Doppler

    Christian Doppler
    Discovery of the 'Doppler Effect' by Austrian physicist and mathematician, Christian Doppler.
  • Samuel Heinrich Schwabe

    Samuel Heinrich Schwabe
    Samuel Heinrich Schwabe describes the sunspot cycle.
  • Johann Galle

    Johann Galle
    Johann Galle observes and discovers Neptune. His observations were prompted by mathematical calculations by French astronomer Joseph Leverrier and English astronomer John Couch Adams.
  • Sir WIlliam Huggins

    Sir WIlliam Huggins
    The beginning of spectral analysis of stars by Sir William Huggins
  • Henry Draper

    Henry Draper
    Henry Draper takes a photograph of the stellar spectrum of Vega. This is the first of its kind.
  • Asaph Hall

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

    Hertzsprung
    Hertzsprung describes giant and dwarf stars.
  • Hertzsprung and Russel

    Hertzsprung and Russel
    Hertzsprung and Russel introduce H-R diagram that shows how the characteristics of stars are related.
  • Hubble

    Hubble
    Hubble shows that galaxies exist outside the Milky Way galaxy.
  • Clyde Tombaugh

    Clyde Tombaugh
    Clyde Tombaugh discovers Pluto.
  • James Christy and Robert Harrington

    James Christy and Robert Harrington
    Discovery of Charon, the moon of Pluto, by James Christy and Robert Harrington