Monday, March 30, 2009

Halley's Comet

comet halleyToday marks the first day that Halley's Comet was reliably recorded in history... in 240 BCE. It wasn't, of course, called that - or even so identified until Halley worked out its periodicity, but nonetheless a notation recorded in the Chinese chronicle Records of the Grand Historian, or Shiji, of a comet that appeared in the east is certainly this comet. (It might have been mentioned in even older Chinese records, but this is the earliest certain mention.)

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