the last halley's comet was seen in 1986.
the last halley's comet was seen in 1986.
when was the last halley's comet seen?
1986
halley's comet is visible from earth every 74–79 years.









































section::::see also.









































bullet::::- list of halley-type comets









































bullet::::- halley's comet in fiction









































section::::external links.









































bullet::::- synopsis of the astronomy of comets (1706 reprint of halley's 1705 paper)









































bullet::::- halley's nucleus by giotto spacecraft (esa link)









































bullet::::- image of halley in 1986 by giotto spacecraft (nasa link)









































bullet::::- cometography.com









































bullet::::- 1p/halley at cometbase database









































bullet::::- seds.org









































bullet::::- orbital simulation from jpl (java) / ephemeris









































bullet::::- donald yeomans, "great comets in history"









































bullet::::- a brief history of halley's comet (ian ridpath)
halley's comet
astronomers at the time, including edmond halley, speculated that this comet was a return of a bright comet seen close to the sun in the sky in 1106. 163 years later, the great comet of 1843 appeared and also passed extremely close to the sun. despite orbital calculations showing that it had a period of several centuries, some astronomers wondered if it was a return of the 1680 comet. a bright comet seen in 1880 was found to be travelling on an almost identical orbit to that of 1843, as was the subsequent great comet of 1882. some astronomers suggested that perhaps they were all one comet, whose orbital period was somehow being drastically shortened at each perihelion passage, perhaps by retardation by some dense material surrounding the sun.
kreutz sungrazer