Early next month, skywatchers will get their second—and final—chance
this century to observe a rare mini-eclipse in which Venus crosses in
front of the sun. As seen from Earth on 5-6 June, the silhouette of
Venus, as big as a large sunspot, will adorn the sun's orange disk with a
fleeting beauty mark. Venus's passages, or transits, occur in pairs
spaced 8 years apart every 105 or 122 years. The next transit isn't
until 2117.
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