ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Andrew Claude de la Chalois Crommelin (1865-1939), Irish astronomer. Born in Ireland, Crommelin worked as an assistant at the Royal Observatory in Greenwich, London from 1891-1927. In 1919 he assisted Arthur Eddington in his observations of a solar eclipse, which demonstrated the bending of starlight as predicted by Albert Einstein's theory of general relativity. Crommelin led the expedition to Sobral, Brazil to gather data. He was an expert on comets, and proved that what were thought to be several comets was actually a single periodic comet, which is now named in his memory. He was also president of the Royal Astronomical Society from 1929 to 1931.
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