ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Venus. Diagram from Henry Chamberlain Russell's book Observations on the transit of Venus, 9 December 1874: made at stations in New South Wales. Venus is at centre, the Sun is yellow. Several expeditions were organised to different locations to observe the 1874 transit. The combined results helped established the distance of Venus and the Sun, and hence the size of the solar system.
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