Did Comet Heinrich-Swift-Tuttle terminate Roman and global civilization?
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“In the same year frightening omens were seen, namely comets, which were visible from October 17 to November 1. This phenomenon made many people tremble, because they feared a furious plague or at least an overthrow of the regime. At the least, many disturbing signs appeared before Heinrich's passing [936 AD] . The sun was without light, although the skies were clear and cloudless, but it looked blood-red through the windows. Also, it was said, the mountain in which the mighty king was buried spat fire in several places. / The comet was followed by a flood and the latter by a pestilence of cattle..."
Widukind of CORVEY (925-973 CE) Rerum gestarum saxonicarum libri tres Liber II: XXXII. DE PORTENTIS
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Orbit and debris of Comet Swift-Tuttle - creating the Perseid meteorites showers (Astronomic Picture of the Day August 8, 2018)
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Neanderthal string