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Halley's Comet

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== Background information ==
 
== Background information ==
This comet has a regular orbit of approximately 76 years. Halley's Comet was often visible from Earth's surface when nearing perihelion, its point of least distance from Sol. Two of Halley's appearances marked the years of the birth (1835) and death (1910) of the famous American writer Samuel Clemens. After 1910, Halley's Comet's perihelia occurred, or will occur, on:
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This comet has a regular orbit of approximately 76 years. Halley's Comet was often visible from [[Earth]]'s surface when nearing perihelion, its point of least distance from [[Sol]]. Two of Halley{{'}}s appearances marked the years of the birth ([[19th century|1835]]) and death ([[1910]]) of the famous [[American]] writer Samuel Clemens. After 1910, Halley's Comet's perihelia occurred, or will occur, on:
* February 9, 1986
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* [[February|February 9]], [[1986]]
* July 28, 2061
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* [[July|July 28]], [[2061]]
* May 7, 2134
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* [[May|May 7]], [[2134]]
   
Given the gravitational effect of the Sol system planets on the comet, it is nearly impossible to predict accurately the dates of Halley's perihelia past 2134.
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Given the [[gravity|gravitational]] effect of the Sol system planets on the comet, it is nearly impossible to predict accurately the dates of Halley's perihelia past 2134.
   
 
== External link ==
 
== External link ==
 
* {{wikipedia}}
 
* {{wikipedia}}
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[[Category:Comets]]
 
[[Category:Comets]]
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