Halley's Comet

Halley's Comet, first periodic comet to be identified (by Edmund Halley) and the brightest of all recurring comets. It has a period of about 76 years. Records exist for every appearance of the comet since 240 B.C., except that of 163 B.C. The comet's most recent reappearance was in 1986.

See also: Comet; Halley, Edmund.