Halley found the similarities in the orbits of bright comets reported in 1531, 1607, and 1682 and he suggested that the trio was actually a single comet making return trips. Correctly predicting ...
and one he had observed himself in 1682. 'Each appearance was separated by 75 years. PROF. SIMON SCHAFFER:'Convinced that these three sightings were of the same comet. 'Halley made a public ...
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