Astronomy Timeline

  • Jan 1, 1000


    -born 384 B.C
    -Influenced Western thought
    -discussed the systematic understanding of logic, physics, and astronomy,
    -know for his diverse explainations of phyics, government, ethics, zoology
  • Jan 1, 1000


    -born 569 B.C.
    -invented the Pythagorean Theorem in geometry
    -"first pure mathematician"
    -little is known about his life, due to he lived in a secrecy enviroment
  • Jan 1, 1000


    -born in 190 BC
    -is known for finding numerical data from observations into geometric models
    -discovered the precession of the equinoxes
  • Jan 1, 1000

    Ancient Greek Astronmy

    Ancient Greek Astronmy
    -looked at astronomy in the sense of math instead of making observations
    -this is how they discovered that the Earth orbits around the sun
    -also calculated the size of the Earth
  • Jan 1, 1000

    Aristarchus of Samos

    Aristarchus of Samos
    -born in 310 BC
    -first to suggest that the Earth revolves on an axis and moves around the sun
    -his ideas were not accepted until the 1500s
    -He used Euclid's geometric theories, and his own, to do his calculations
  • Jan 1, 1000


    -born in 276 BC
    -first person to find the actual circumference of the Earth
    -he measured shadows in two different towns at the same time of day, then mesaured the distances between the two towns and calculated the circumference of the Earth
  • Feb 19, 1473


    -he believed the sun was the stationary center of the solar system and the Earth revolved around it
    -first to propose the idea of a heliocentric cosmology
  • Dec 14, 1546

    Tycho Brahe

    Tycho Brahe
    -discovered the first "new star" which was supernova
    -thought the Earth was the centre of the universe, and the other planets were satellites of the sun
  • Feb 15, 1564

    Galileo Galilei

    Galileo Galilei
    -Kinematics, dynamics, telescopic observational astronomy and heliocentrism
    -discovered four satellites in orbit around Jupiter
    -one of the first people to observe sunspots
  • Dec 27, 1571

    Johannes kepler

    Johannes kepler
    -know for his formulations of verifying the three laws of planetary motion. (later became know as Kepler's Laws)
    -Wrote a book on how all the planets orbital periods are at a constant and are all the same
    -proposed that the sun produced a force that diminishes the distance and pushes the planets around their orbits
  • Isaac Newton

    Isaac Newton
    -discovered the 3 laws of motion
    -usually refered to as the "most original and influential theorist in the history of science"
    -Realized the moons circular path around the Earth was caused by gravitational pull
  • Annie Jump Cannon

    Annie Jump Cannon
    -studied variable stars and stellar spectra
    -she published a catalog of 1,122 southern stars, which represented a continuous change from the blue-white stars, later this was founded as temperature sequence
    -published the "Henry Draper Catalogue", which listed spectral types, magnitudes, and positions of 225,300 stars
  • George Hale

    George Hale
    -invented the spectroheliograph, which he used to study features of the sun
    -founded 3 observatories
    -made observations that the sun spots were cooler than the surrounding area and they were strongly magnectic
  • Henrietta Swan Leavitt

    Henrietta Swan Leavitt
    -discovered Luminosity
    -used plates to discover a stars magnitude and used "the north polar sequence" to detemine the stars brightness
    -determined the distances between stars by light years
  • Albert Einstein

    Albert Einstein
    -formulated the Special Theory of Relativity
    -formulated the Mass-Energy relations
    -1921 Nobel prize in physics
  • Edwin Hubble

    Edwin Hubble
    -California's Mount Wilson Observatory
    -Discovered Cepheids were outside of the Milky Way Galaxy, proving the existance of other galaxies
    -1929 invented Hubble's Law, which let other astronomiers determine the actual age of universe
  • Gerard Kuiper

    Gerard Kuiper
    -Kuiper Belt was proposed by him in 1951
    -Kuiper belt consist of disk shaped minor planets outisde of the orbit of Neptune. short-period comets come out of this area
    -also he discovered Saturn's satellite moon and the carbon dioxide atmosphere of Mars
  • Bengt Georg Daniel Stromgren

    Bengt Georg Daniel Stromgren
    -found relations between the gas density, the luminosity of the star, and the size of the “Strömgren sphere” of ionized hydrogen around it
    -1930: research in stellar structure
    -is best known for his work on ionized gas clouds
  • Subrahmanyan Chandrasekhar

    Subrahmanyan Chandrasekhar
    -the first person to theorize that a collapsing massive star would become an object so dense that not even light could escape it
    -formed the foundation of the theory of black hole
    -theorems on the stability of cosmic masses in the presence of gravitation, rotation, and magnetic fields
  • Grote Reber

    Grote Reber
    -built the first radio telescope
    -discovered radio waves from Cygnus and Cassiopeia for the first time
    -discovered radio waves at very low frequencies
  • James Van Allen

    James Van Allen
    -discovered that radiation belts surround the Earth, now radiations fields around the earth are commonly refered to as "Van Allen belts"
    -explored the outer reaches of earth's atmosphere and the magnetosphere
  • Sir Fred Hoyle

    Sir Fred Hoyle
    -Made predictions 10 years before the dawn of space flight, that all came true
    -Developed the steady-state cosological theory and rephased the 'Big Band' theory on BBC radio in 1949
    -His wife and him published books about their predictions
  • E. Margaret Burbidge

    E. Margaret Burbidge
    -helped/planned and outfitted the Hubble Space Telescope
    -recognized for the production of the first accurate estimate of the masses of galaxies
    -known for her work with quasars, and for work she did concerning the metal contents of stars
  • Eugene Shoemaker

    Eugene Shoemaker
    -pioneer work in elucidating the mechanics of impacts and discovering of Earth-crossing bodies
    -1933 he discovered a comet that would strike Jupiter 16 months later
    -led the leading comet discoverers of this century
    -discovered more than 800 asteroids
  • Thomas Mutch

    Thomas Mutch
    -published two books about the Moon and Mars
    -presumed killed when he disappeared in Mount Nun
    -He has a crater on Mars named after him
    - Led the Lander Imaging team from the Viking Mission to Mars