KROMMELIN Andrew Claude (Crommelin Andrew Claude)( English astronomer.)
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Biography KROMMELIN Andrew Claude (Crommelin Andrew Claude)
Born February 6, 1865 in Kushendene (Northern Ireland). He studied at Marlborough College, then at Trinity College, Cambridge University. He was accepted into the state Lancing College, in 1891 was appointed assistant at Greenwich Observatory, where he studied the orbits of comets and minor planets. Together with F. Cowell improved method for calculating the perturbations of periodic comets. In this paper about the return of Halley's Comet (Essay on the Return of Halley's Comet), scientists have traced the passage of the comet through perihelion until 240 BC. and, 'with less confidence', to 625 BC. Predicted the return of a comet in 1910 with an accuracy of 3.03 days. For this work he received a prize. Lindemann German Astronomical Society, and a Ph.D. at Oxford University. Krommelin participated in expeditions to observe solar eclipses in 1896, 1900, 1905, 1912 and 1927. In 1919 he was invited by the Standing Joint Committee on the eclipse expedition to Brazil, specially organized for measuring the deflection of light in a gravitational field of the Sun. From 1898 to 1906 was engaged in the ephemeris calculation for Mars, Jupiter, Saturn and the Moon. More than forty years Krommelin post messages on comets and minor planets in the journal 'Observatory' ( 'Observatory') and in the 'Journal of the British Astronomical Association' ( 'Journal of the British Astronomical Association'). Was the author of the catalog of comets (Comet Catalogue, 1925), together with M. Proctor wrote a book Comets (Comets, 1937). Krommelin died in London on 20 September 1939.