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The last pairs of transits occurred on 8 June 2004 and 5-6 June 2012. The next pair of transits will occur on 10-11 December 2117 and 8 December 2125. A transit lasts approximately 6 hours.

Transits of Venus provided the first opportunities to accurately calculate the distance from Earth to Venus, by which the astronomical unit and the distances of the other Solar System

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