Astronomers

What lands on a date

• 01-28 Johannes Hevelius · Gdańsk astronomer who mapped the Moon and named constellations. source
• 02-04 Clyde Tombaugh · Farmer-astronomer who discovered Pluto. source
• 02-14 Fritz Zwicky · Astrophysicist who inferred dark matter and neutron stars. source
• 02-19 Nicolaus Copernicus · Canon who placed the Sun at the planetary system's centre. source
• 03-06 Joseph von Fraunhofer · Optician who mapped the Sun's absorption lines. source
• 03-07 John Herschel · Astronomer who catalogued southern nebulae and pioneered photography. source
• 03-11 Urbain Le Verrier · Mathematician who predicted Neptune from orbital perturbations. source
• 03-13 Sidereus Nuncius · Galileo's pamphlet announcing Jupiter's moons and lunar mountains. source
• 03-14 Giovanni Schiaparelli · Observer whose Martian canals sparked decades of speculation. source
• 03-15 Nicolas-Louis de Lacaille · Surveyor of southern skies who named many constellations. source
• 03-16 Caroline Herschel · First woman to discover a comet and earn a royal salary. source
• 03-22 Ulugh Beg · Timurid prince who built Samarkand's great observatory. source
• 04-14 Christiaan Huygens · Physicist who discovered Titan and explained Saturn's rings. source
• 04-28 Jan Oort · Dutch astronomer who mapped galactic rotation and the comet cloud. source
• 05-10 Cecilia Payne-Gaposchkin · Astronomer who showed stars are mostly hydrogen. source
• 05-15 Williamina Fleming · Harvard computer who catalogued thousands of stars. source
• 06-08 Giovanni Domenico Cassini · Observer who discovered the gap in Saturn's rings. source
• 06-24 Fred Hoyle · Cosmologist who named the Big Bang and seeded nucleosynthesis. source
• 06-26 Charles Messier · Comet hunter whose catalogue listed galaxies and nebulae. source
• 06-28 Angelo Secchi · Jesuit astronomer who classified stars by their spectra. source
• 07-04 Henrietta Swan Leavitt · Discovered the relation that measures cosmic distances. source
• 07-15 Jocelyn Bell Burnell · Graduate student who discovered pulsars. source
• 07-22 Friedrich Bessel · Astronomer who first measured a star's parallax. source
• 07-23 Vera Rubin · Observer whose galaxy rotations revealed dark matter. source
• 08-01 Maria Mitchell · First American woman to discover a comet. source
• 08-19 John Flamsteed · First Astronomer Royal and compiler of a landmark star catalogue. source
• 09-25 Ole Rømer · Danish astronomer who first measured the speed of light. source
• 10-19 Subrahmanyan Chandrasekhar · Theorist who calculated the mass limit of white dwarfs. source
• 11-02 Harlow Shapley · Astronomer who located the Sun far from the galaxy's centre. source
• 11-08 Edmond Halley · Astronomer who predicted his comet's return. source
• 11-09 Carl Sagan · Planetary scientist who popularized cosmic science. source
• 11-15 William Herschel · Musician-turned-astronomer who discovered Uranus. source
• 11-20 Edwin Hubble · Observer who proved galaxies lie beyond the Milky Way. source
• 12-07 Gerard Kuiper · Planetary scientist who discovered moons and predicted comet belts. source
• 12-11 Annie Jump Cannon · Harvard astronomer whose spectral classes became standard. source
• 12-14 Tycho Brahe · Danish nobleman whose precise observations enabled Kepler's laws. source
• 12-27 Johannes Kepler · Mathematician who found the elliptical laws of planetary motion. source
• 12-28 Arthur Eddington · Astrophysicist whose eclipse expedition confirmed general relativity. source

The year rail

Some lives are known by year, not by day. Those entries are kept on a rail — never placed on a fabricated date.

• Aristarchus of Samos -310
• Hipparchus -129
• Ptolemy 150
• Aryabhatiya 499
• Al-Battani 929
• Abd al-Rahman al-Sufi 903