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1639 in science
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==Astronomy== * [[Giovanni Battista Zupi]] observes that the planet [[Mercury (planet)|Mercury]] has [[orbit]]al [[Planetary phase|phases]]. * December 4 (November 24 in [[Julian calendar]]) β [[English people|English]] [[astronomer]]s [[Jeremiah Horrocks]] and [[William Crabtree]] are the first and only scientific observers of a [[Transit of Venus, 1639|transit of Venus]], predicted by Horrocks.
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