ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Transit of Venus, Mauritius. This expedition travelled to Belmont on Mauritius in the Indian Ocean to observe the transit of Venus that took place on 9 December 1874. Such transits (where Venus passes across the Sun as seen from the Earth) are rare, occurring in pairs over 100 years apart. The 19th-century transits (1874 and 1882) saw numerous expeditions to make observations. The results helped establish the size of the solar system. From left: Henry Davis (1825-1900), Ralph Copeland (1837-1905), expedition leader Lord Lindsay (James Ludovic Lindsay, 1847-1913), David Gill (1843-1914), and the expedition surgeon Dr Blackley.
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