Ancient Chinese astronomers discovered Halleys comet in prehistoric times in roughly 240BC. This is however is debated as there is a possibility that an ancient Greek gossamer event in 466BC may be evidence of a sighting of Halleys comet which lasted 80 days. Edmond Halley discovered Halleys field of study pattern and more randomness about the comet in 1705. later(prenominal) on, roughly 12 years after his death his information was proven and it was thus named after him.
Halleys Comet was last seen on the 9th February 1986. There was much disappointment to this appearance as distant in previous sightings it was barely visible to the naked eye. It was the to the lowest degree favorable sighting as the earth as the comet was on foeman sides of the sun during the time of the sighting. In addition increase light pollution from urbanization caused many people to neer see the comet at all.
The length of Halleys comets orbit is approximately 76 years, though it has varied from 74-79 years since 240BC. The perihelion, the point in which the comets orbit is nearest the sun is just 0.6AU and when farthest from the sun 35AU (roughly the distance of Pluto). Unusual for an object in the solar system, Halleys comet s orbit is retrograde, orbiting the sun in the opposite direction to the planets.
Halleys is judge to next appear on 28th July 2061. It is expected to be in a bettor position for observation than in 1986 as the earth and the comet pass on be on the same side of the earth and is expected to have a magnitude of -0.3 compared with only +2.1 in 1986.
Halleys comet has been sighted many times in many generations and in reality had an impact on history. It was sighted in the year 1066AD preliminary to the famous battle of Hastings, when the forces of England were defeated by the Norman invader William the Conqueror. Comet Halley is featured in a famous portion of the Bayeaux Tapestry, a medieval tapestry that details the Norman conquest of England.
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