Halley's Comet
Halley's Comet Halley's Comet or Comet Halley , officially designated 1P/Halley , is a short-period comet visible from the earth every 75-76 years . Halley is the only known short-period comet that is regularly visible to the naked eye from the earth, and the only naked-eye comet that might appear twice in a human lifetime. Halley last appeared in the inner part in the solar system in 1986 and will next appear in mid-2061 to 2062 . Halley's return to the inner solar system has been observed and recorded by the astronomers since 240BC . Clear records of the comet's appearance were made by Chinese, Babylonian and medieval European chronicles , but, at those times were not recognised as appearances of the same object. The comet's periodicity was first determined in 1705 by English astronomer Edmond Halley , after whom it is now named.