Astronomy This Month

By John Loci

Today in Astronomy History

May 18, 1048
Persian astronomer and stellar cartographer, Omar Khayyam, is born. Omar Khayyam calculate the length of the year to 6 decimal places with a one day error every 5000 years (The Gregorian calendar has a one day error every 3330 years.)

May 18, 1910
The Earth passes through the tail of Halley's Comet

May 18, 1969
Apollo 10 Launches

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