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In page Venus:
"The preceding pair of transits occurred in December 1874 and December 1882; the following pair will occur in December 2117 and December 2125.[3] The oldest film known is the 1874 Passage de Venus, showing the 1874 Venus transit of the sun. Historically, transits of Venus were important, because they allowed astronomers to determine the size of the astronomical unit, and hence the size of the Solar System as shown by Horrocks in 1639.[4] Captain Cook's exploration of the east coast of Australia came after he had sailed to Tahiti in 1768 to observe a transit of Venus.[5][6]
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