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Joseph-Nicolas Delisle (4 April 1688 – 11 September 1768) was a French astronomer and cartographer. ==Life== He was born in Paris, one of the 11 sons of Claude Delisle (1644–1720). Like many of his brothers, among them Guillaume Delisle, he initially followed classical studies. Soon however, he moved to astronomy under the supervision of Joseph Lieutaud and Jacques Cassini. In 1714 he entered the French Academy of Sciences as pupil of Giacomo Filippo Maraldi. Though he was a good scientist and member of a wealthy family he did not have much money. In 1712 he set up an observatory at the Luxembourg Palace and after three years moved to the Hotel de Taranne. From 1719 to 1722 he was employed at the Royal observatory, before returning to his observatory at the Luxembourg Palace.〔 In 1724 he met Edmond Halley in London and, among other things, discussed transits of Venus.〔Wulf, Andrea. ''Chasing Venus: The Race to Measure the Heavens.'' New York City: Knopf Doubleday Publishing Group. 2012, Chap. 1.〕 His life changed radically in 1725 when he was called by the Russian czar Peter the Great to Saint Petersburg to create and run the school of astronomy. He arrived there only in 1726, after the death of the czar. He became quite rich and famous, to such an extent that when he returned to Paris in 1747, he built a new observatory in the palace of Cluny, later made famous by Charles Messier. Also he received the title of Astronomer from the Academy. In Russia he prepared the map of the known North Pacific that was used by Vitus Bering. He was elected a Fellow of the Royal Society in 1725〔(【引用サイトリンク】 Library and Archive Catalogue )〕 and a foreign member of the Royal Swedish Academy of Sciences in 1749. In 1760 he proposed that the international scientific community coordinate observations of the 1761 Transit of Venus in order to determine the absolute distance of the Earth from the Sun. He developed a map showing where on Earth this transit would be visible and thus where various observing stations should be located. Actual implementation of these observational efforts were hindered by the Seven Years' War.〔 In 1763 he retired to the Abbey of St Genevieve, dying in Paris sometime in 1768. 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「Joseph-Nicolas Delisle」の詳細全文を読む スポンサード リンク
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