ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Transit of Venus observing station. This hut design, being checked before transport, was used by five expeditions organised by the Royal Observatory, Greenwich, London, UK. This is the hut for Station B, the expedition to Honolulu, Hawaii. The Simms equatorial telescope and the regulator (clock) are visible in the hut. Transits of Venus (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 distances of Venus and the Sun, and hence the size of the solar system.
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