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Sir Harold Spencer Jones, KBE (1890—1960)

Tenth Astronomer Royal from (1933—55)


Under Spencer Jones, the Observatory worked with the Post Office (GPO) to give us the speaking clock, he also had a quartz crystal clock at Greenwich, and moved the work, staff and equipment of the Observatory to Herstmonceux Castle in Sussex.

A graduate of Jesus College, Cambridge, Spencer Jones began working at the Royal Observatory Greenwich in 1913 as chief Assistant. In 1923 he left to become HM Astronomer at the Cape of Good Hope. In 1928 Spencer Jones was put in charge of an international project initiated by the International Astronomical Union to calculate the distance of the Sun from Earth using photographs of the minor planet Eros, taken from 24 Observatories around the Earth. In the 1930s he again worked on Eros and in 1941 announced an improved value of solar parallax. He also worked on the colour and temperature of stars, and on the Earth's rotation, publishing an important paper in 1939 showing the Earth's rotation was not uniform.

During the Second World War Spencer Jones was appointed Assistant Director of Inspection of Optical Supplies for the Ministry of Munitions. In 1946 it was decided that the Observatory should be moved to Herstmonceux Castle in Sussex, a move which took place over a number of years. 

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