Halley's Comet Roars: Earth's Closest Approach Ever
Halley's Comet passed within 5.1 million kilometers of Earth on April 10, 837 AD, its closest recorded approach and one of the most spectacular astronomical events of the medieval period. Chinese astronomers of the Tang Dynasty documented a tail stretching across the entire visible sky. European chronicles recorded widespread panic, with the comet interpreted as a harbinger of war, plague, or dynastic change. The comet returns approximately every 75-79 years. Edmond Halley first calculated its periodic orbit in 1705 by connecting observations from 1531, 1607, and 1682. Its most recent pass in 1986 was disappointingly faint due to its unfavorable position relative to Earth, but the 837 approach remains the closest in over 2,000 years of records.
April 10, 837
1189 years ago
Key Figures & Places
What Else Happened on April 10
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