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It has been questioned whether comet 1P/Halley that appeared on 1222 September 9 was bright enough to be observed in daylight, as recorded in the Korean account. We investigate the light curve of 1P/Halley in the 1222 apparition considering brightness enhancement of the comet by forward-scattering, in order to verify the Korean account. We first analyze the Korean accounts of 1P/Halley observed in...
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