What Happened in 837 AD
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- Feb 27 15th recorded perihelion passage of Halley's Comet
- Apr 10 Comet 1P/837 F1 (Halley) approaches within 0.0334 AUs of Earth
- Apr 13 Best view of Halley's Comet in 2,000 years
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List of Years
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V