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How did Edmund halley discovered Halley's comet?

Answer:
Well, he didn't exactly discover it. He did some calculations about its orbit, and concluded that this particular comet (observed by other people) was the same that had been seen about 76 years earlier. He also said the comet would return, in about 76 years.
First answer by Hilmarz. Last edit by Hilmarz. Contributor trust: 802 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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