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→Halley's Comet
=== Halley's Comet ===
[[Image:Colt05.jpg|right]]"[http://en.wikipedia.org/wiki/Comet_Halley Comet Halley] ... more generally known as Halley's Comet after Edmond Halley, is a comet that can be seen every 75-76 years. It is the most famous of all periodic comets, even though in every century many comets appear brighter and more spectacular. Halley's comet last appeared in the inner Solar System in 1986, and will next appear in the summer of 2061." (Source: Wikipedia)
In 1835, it achieved perihelion on 16 November, but would have been visible from Earth for several months before and after.
=== The number 13 ===
