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Donald Harry Sadler (1908–1987) was an English astronomer and mathematician who developed an international reputation for his work in preparing astronomical and navigational almanacs. He worked as the Superintendent of His Majesty's Nautical Almanac Office from 1937 to 1971. ==Early life== Donald Sadler was born in Dewsbury, Yorkshire, on 22 August 1908. He attended the local grammar school where he excelled in mathematics. He studied mathematics at the University of Cambridge and received a first-class degree in 1929.〔〔 Sadler developed an interest in celestial mechanics during his studies at Cambridge. He contributed to the work of the Computing Section of the British Astronomical Association.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Donald Sadler」の詳細全文を読む スポンサード リンク
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