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|+ Minor planets discovered: 1 He became second chief assistant at the Royal Greenwich Observatory in 1896 and later became the Superintendent of HM Nautical Almanac Office between 1910 and 1930. He worked on celestial mechanics, and orbits of comets and minor planets in particular. He also carefully studied the discrepancy that then existed between the theory and observation of the position of the Moon.
Cowell was elected a Fellow of the Royal Astronomical Society on 14 February 1896. On 27 October 1897 he was elected a member of the British Astronomical Association. He was also elected a Fellow of the Royal Society on 3 May 1906.
He died in Aldeburgh, Suffolk on 6 June 1949. The main-belt asteroid 1898 Cowell is named after him.
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