Medieval monk Eilmer of Malmesbury famously attempted to fly by jumping from a 150-foot tower around 1000-1010 CE, breaking both legs in the crash. Historians debate whether Eilmer witnessed Halley's comet twice (in 989 and 1066) or saw a different comet in 1018, which would affect estimates of his birth year and whether he understood the comet's periodicity.
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Medieval monk Eilmer of Malmesbury famously attempted to fly by jumping from a 150-foot tower around 1000-1010 CE, breaking both legs in the crash. Historians debate whether Eilmer witnessed Halley's comet twice (in 989 and 1066) or saw a different comet in 1018, which would affect estimates of his birth year and whether he understood the comet's periodicity.