The Halley's Comet, officially 1P/Halley, is a large and bright periodic Comet that orbits the Sun every 76 years on average, although its orbital period may range between 74 and 79 years. It is one of the best known and brightest of the short-period comets of the Kuiper Belt. Its orbit was calculated for the first time by astronomer Edmund Halley in 1705. The first recorded observation is from the year -239. It is the only short-period kite visible to the naked eye for twice in the period of a human life. In 1910 his approach to Earth assumed that its tail brushed against the upper layers of the Earth's atmosphere, and in 1986 he was visited and accompanied by an army of space probes.
