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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