|-5000 to -4001
Egyptian calendar, regulated by the Sun and the Moon.
-2500 to -2001 Chinese lunar calendar
-1500 to -1001 Obelisks in Egypt possibly used as sundials
-1900 Stonehenge built. Possibly a calendar to chart the movement of the sun, moon and the planets.
-250 to -201 Eratosthenes suggests that the Earth moves around the Sun
517 Hindu Aryabhata complies his manual of astronomy
813 School of astronomy at Baghdad started
1050 Important astronomical instruments arrive in Europe from the Eastern countries
1054 A minor star in the constellation Taurus explodes in a supernova visible for the following 656 nights.
1066 The Halley Comet is first recorded in the European sky
1080 Toledan table of stars
1091 Walcher of Malverin notes the eclipse of the Moon in Italy
1512 Nicolaus Copernicus (1473-1543) states that the Earth and the other planets rotate around the Sun
1537 Niccolo Tartaglia discusses the motion of heavenly bodies in the book Nova Scientia
1572 Tycho Brahe destroys the idea that no changes can occur within the sky by discovering a new star
1602 "Theriques of the Planets" by Thomas Blondeville
1608 Galileo Galilei (1564-1842) constructs astronomical telescope
1613 Galileo Galilei discovers sunspots
1616 Wllebrord Snellius discovers the law of refraction
1639 Jeremiah Horrocs observes the transit of Venus which he had predicted
1647 Johann Hevel writes a book about the lunar surface
1666 Isaac Newton measures the orbit of the moon
1675 Olaus Romer discovers the finite velocity of light
1728 James Bradley discovers the aberration of light from fixed stars
1739 John Winthrop publishes his " Notes on sunspots"
1750 Johann Tobias Mayer: "Map of the Moon"
1761 Mikhail V. Lomonosov discovers atmosphere on Venus
1781 William Herschel discovers Uranus
1788 Marquis Pierre Simon de Laplace: "Laws of the Planetary System"
1797 H. W. M. Olberts publishes his method for calculating orbits of comets
1800 William Herschel discovers infrared solar rays
1868 Joseph Normann Cockyer discovers helium in the spectrum of the Suns atmosphere
1877 Giovanni V. Schiaparelli observes Marsı canals
1905 Albert Einstein publishes his theory of relativity
1912 Victor F. Hess discovers cosmic radiation
1917 100-inch reflecting telescope installed at Mount Wilson, California
1918 Harlow Shapely discovers the true dimensions of the Milky Way galaxy
1925 Solar eclipse in New York is first in 300 years
1929 Edward Hubble measures large red shifts in the spectra of extragalactic nebulae
1930 Pluto discovered. First planetarium in the western hemisphere built.
1932 Karl Jansky establishes a foundation for radio astronomy
1937 Grote Reber builds the worldıs first radio telescope.
1938 Grote Reber receives short waves from the Milky Way
1945 Lajos Janossy explores cosmic radiation
1946 Edward V. Appleton discovers that the sunspots emit radiation
1948 200-inch reflecting telescope erected
1953 Cosmic ray observatory erected on Mount Wrangel, Alaska
1971 American astronomers discover two "new" galaxies adjacent to the Milky Way
1977 Discovery of a mini-planet orbiting the sun between Saturn and Uranus
1978 Discovery of a moon orbiting Pluto
1979 Discovery of rings around Jupiter
1980 Six more moons around Saturn discovered
1981 NASA scientists announce that two unusual meteorites found in the Antarctic may have originated on Mars
1981 The discovery of the most massive star known, R136a. It is 2500 times larger than the sun, but is only 10 times brighter
1984 NASA photographs a planetary system around the star Beta Pictoris
1985 University of California, Berkeley gains more evidence of a black hole in the center of our galaxy
1986 Voyager 2 flies by Uranus discovering ten new moons
1987 The nearest supernova detected since 1604 is observed in the Large Magellanic galaxy
1987 Alexander Arkhipov identifies 9 of 4500 "sun-like" stars
1988 Australia unveils the largest telescope in the southern hemisphere
1988 Pluto is confirmed to have an atmosphere
2000 This timeline is written