Halley's Comet Definition
A famous comet, last seen in 1986, whose reappearance about every 76 years was predicted by Edmond Halley.
A very bright comet which can be seen from Earth every 75-76 years.
Origin of Halley's Comet
(Circa 1758) Named for Edmond Halley, the English astronomer who first computed its orbit and established its periodicity (observations of individual passages date back at least to 240 B.C.). Halley predicted the return of the comet (then last seen in 1682) in 1705; when it did return in late 1758, it quickly acquired this name.
After Edmund Halley
From American Heritage Dictionary of the English Language, 5th Edition
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