...The star catalog in Ptolemy's Almagest was a conversion of Hipparchus' observations of the positions of 1,022 stars from around the 2nd century BCE into coordinates in 138 AD, and many star catalogs up until the Middle Ages were based on this original source and simply converted the coordinates. Ulugh Beg of the Timurid dynasty built an observatory in Samarkand in 1420, and the results of observations there were compiled in Ulugh Beg's Astronomical Tables (1437). The format of the star catalog is the same as Ptolemy's, and 1,018 stars are recorded. ... *Some of the terminology used in reference to "Ulugh Beg's Astronomical Tables" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…プトレマイオスの《アルマゲスト》にある星表はヒッパルコスの前2世紀ころの1022個の星の位置観測を138年の座標に換算したもので,その後中世までの諸星表はこれを原典として座標を換算しただけのものが多い。ティムール王朝のウルグ・ベクは,1420年サマルカンドに天文台を建設,ここでの観測の成果はウルグ・ベクの天文表(1437)にまとめられた。星表の記載形式はプトレマイオスのものと同じで,星1018個が記録されている。… ※「ウルグ・ベクの天文表」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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