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why does halley's repeat it's appearance? after how many years does it reappear?

Halley's Comet revolves around the sun and hence it repeats.
It repeats itself after every 76 years.

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It is a comet which keeps on revolving. It appears every 76 years.

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As halley's is a comet and it revolves around the sun in very large orbit, it takes 76 years for it to complete one revolution of the sun. So, it passes from near the earth after every 76 years and hence we are able to see it after every 76 years.

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