Halley's comet

Halley predicted that the comet of 1682 would return in 1758. Amateur astronomer spotted it on Dec 25, 1758. Retrospectively, it turned out that this was the same comet seen by William the Conqueror, and the same one painted by Giotto.
 Johann Georg Palitzsch England 1758 Halley's comet

Halley predicted that the comet of 1682 would return in 1758. Amateur astronomer spotted it on Dec 25, 1758. Retrospectively, it turned out that this was the same comet seen by William the Conqueror, and the same one painted by Giotto.