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HALLEY'S COMET

Before Astronomer Royal Edmond Halley (1656-1742) studied and predicated the return of the famous comet that now bears his name, no one had succeeded in proving that comets travel in predictable orbits. Halley computed the orbits of some 24 comets, but the return in 1759 - as he had calculated - of the comet he had observed in 1682 established. Because it is numerous sighting were noted during preceding centuries, and by comparing them with calculation of the comet's orbit, these can now be identified as having been Halley's Comet. There have been about 30 recorded appearances, including that of 1066, believed to presage the victory of William the Conqueror, and the most recent in 1986 when it was examined by Giotto probe. 




 CO PARTER: The Jupiter Scientist 

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