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coming soon, twice in our life-time – a venus transit The last time the planet Venus was seen passing across the disk of the sun – a Venus transit – was in 1882. Transits across the sun are possible only with Mercury and Venus, the two planets with orbits closer to the sun than the Earth. Mercury has an average of thirteen passages every century, but transits of Venus occur in pairs at more-than-century intervals.
From the NASA Eclipse site:
The NASA link also gives links to details of when and where in the sky observers in different locations may see this event. This British site gives, with diagrams, a detailed explication why Venus transits occur so infrequently, and in pairs often 8 years apart.
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