Did a medieval flying monk spot Halley's comet, twice? It's complicated
University of Leicester historian thinks Eilmer of Malmesbury saw two different comets: in 1018 and 1066 https://arstechnica.com/science/2026/06/did-a-medieval-flying-monk-spot-halleys-comet-twice-its-complicated/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social
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The night sky had no light pollution until the introduction of gas lights on the streets. People would have seen many more comets in Medieval times.