ESA - Space Science - 6 December

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	Dual transit of Venus and ISS on 8 June 2004

6 December

1631: On 6 December 1631, the transit of Venus occurred as first predicted by Kepler.

He correctly predicted that a transit of Venus would occur but nobody observed it due to the fact that it occurred after sunset for most of Europe. He not only predicted this particular transit but also worked out that transits of Venus involve a cyclic period of approximately 120 years.

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