Every 75 to 76 years and is scheduled to reappear in 2061.
http://wiki.answers.com/Q/How_often_does_Halley's_Comet...
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"Earth comes close to the orbit of Halley's comet twice a year, once in May and again in October," explains Don Yeomans, manager of NASA's Near-Earth Object Program at the Jet Propulsion Laboratory.
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science.nasa.gov/headlines/y2002/20oct_orionids.htm
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This image of Comet Halley's nucleus was taken by the Giotto spacecraft during a flyby on March 13, 1986. Scientists estimate that about 10% of the surface was boiling off into space. The stuff that boiled off Halley in 1986 may one day be seen again during an Orionid meteor shower.
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science.nasa.gov/newhome/headlines/ast20oct98_1.htm
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Why does Comet Halley come back regularly? ... The coma and tail of a comet, indicated on a photograph of Halley's Comet taken on May 8, 1910. (Mt. Wilson Observatory photograph.
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www.astrosociety.org/education/publications/tnl/01/01.h...
www.astrosociety.org/education/publications/tnl/01/01.html
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Englishman Edmond Halley predicted in 1705 that the comet that appeared over London in 1682 would reappear again in 1759, ... Working backwards, it was also discovered that Halley's comet had been reappearing in the historical record for thousands of years. The earliest recorded observation so far discovered was made in 239 B...
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www.astropix.com/HTML/F_COMETS/860322A.HTM
www.astropix.com/HTML/F_COMETS/860322A.HTM
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In 1682 he predicted the comet would return again in 1758, and sure enough, the comet arrived in March 1759. Halley's comet made a particularly bright appearance in 1910. It also was recorded in a famous ancient tapestry after its 1066 appearance.
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www.windows.ucar.edu/tour/link=/comets/Halleys_comet.ht...
www.windows.ucar.edu/tour/link=/comets/Halleys_comet.html
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I came in with Halley's Comet in 1835. It is coming again next year (1910), and I expect to go out with it. It will be the greatest disappointment of my life if I don't go out with Halley's Comet. The Almighty has said, no doubt: "Now here are these two unaccountable freaks;
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www.twainquotes.com/Halley's_Comet.html
www.twainquotes.com/Halley's_Comet.html
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Reflections upon Halley's, and other, Comets ... I came in with Halley's Comet... It is coming again ... and I expect to go out with it... The Almighty has said, no doubt: 'Now here are these two unaccountable freaks; they came in together, they must go out together.'
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www.uh.edu/engines/epi1642.htm
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