The Sky at Prophetstown
Sunrise (0818 hrs.), 7 November 1811

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As the Moon progressed down the ecliptic, it got ever closer to Sirius. So from the perspective of the Moon, Sirius, which being a star, moves more slowly across the sky, nevertheless was closing the gap between them, thus seeming to tag along after the Moon. Overnight into the morning of 7 November, there was slightly more than a half moon, which was not ideal for a night attack.