Named for the English astronomer, Edmund Halley. One of the most brilliant comets viewed from Earth, it reappears approximately every seventy-seven years.

a COMET named after Edmond Halley, d. 1742, who observed it in 1682 and calculated its orbit round the Sun to be approximately every 76 years: illustrated in the Bayeux Tapestry

Halley's comet is a periodic comet (made of frozen gas and dust), that orbits around the sun. Its earliest-recorded sighting was in 240 B.C. in China, but Edmund Halley was the first person to recognize that it was periodic. It was last seen in 1986 and will be seen next in the year 2061; its period is 76 years. When the Earth passes through Halley's comet's orbit (twice each year), its detritus causes the meteor showers the Eta Aquarids and the Orionids.

Halley's Comet, officially designated 1P/Halley and also referred to as Comet Halley after Edmond Halley, is a comet that can be seen every 75-76 years. It is the most famous of all periodic comets. Although in every century many long-period comets appear brighter and more spectacular, Halley is the only short-period comet that is visible to the naked eye, and thus, the only naked-eye comet certain to return within a human lifetime.http://www.astronomytoday.com/astronomy/comets.html Its appearances over the centuries have been noticed to coincide with many notable events in human history, despite the fact that they were not recognized as the same object until the 17th century.

Halley's Comet, I Didn't Know and Snootable Snunshine are three unreleased songs written by Richard Wrighthttp://www.mockingbirdfoundation.org/press/preorder.html (aka Nancy Taube) for the band Phish. All three of them are notable for their extensive vocal harmony.