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''The Nautical Almanac'' has been the familiar name for a series of official British almanacs published under various titles since the first issue of ''The Nautical Almanac and Astronomical Ephemeris'', for 1767: this was the first nautical almanac ever to contain data dedicated to the convenient determination of longitude at sea. It was originally published from the Royal Greenwich Observatory in England.〔 〕〔'ESAE 1961': 'Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac' ('prepared jointly by the Nautical Almanac Offices of the United Kingdom and the United States of America', HMSO, London, 1961)〕〔'ESAA 1992': ed. P K Seidelmann, 'Explanatory Supplement to the Astronomical Almanac' (CA, 1992).〕 A detailed account of how the publication was produced in its earliest years has been published by the National Maritime Museum.〔M Croarken (2002), "Providing Longitude for All".〕 Since 1958 (with the issue for the year 1960), Her Majesty's Nautical Almanac Office and the US Naval Observatory have jointly published a unified Nautical Almanac, for use by the navies of both countries.〔(【引用サイトリンク】 publisher=US Naval Observatory ) 〕 ==Publication history== The changing names and contents of related titles in the series are summarised as follows. (The issue years mentioned below are those for which the data in the relevant issue were calculated—and the issues were in practice published in advance of the year for which they were calculated, at different periods of history, anything from 1 to 5 years in advance). (For many years, official nautical almanacs and astronomical ephemerides in the UK and the USA had a linked history, and they became merged in both titles and contents in 1981.)〔 In the UK, the official publications have been:〔〔ESAE 1961, see esp. sect.1B.〕 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「The Nautical Almanac」の詳細全文を読む スポンサード リンク
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