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Updated: May 3, 2025
Before anything was as yet known of the comet's path or velocity, he announced, from the position of the double sodium-line alone, that at 3 p.m. on September 18 it was increasing its distance from our planet by from 61 to 76 kilometres per second. M. Bigourdan's subsequent calculations showed that its actual swiftness of recession was at that moment 73 kilometres.
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