Celestial observation - Tensoku
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〘Noun〙 Abbreviation of astronomical observation. Originally, it meant measuring the direction and altitude of celestial bodies using a sextant or other instrument to determine the position of a ship at sea. ※Undersea Travel (1929)〈Translated by Shinji Kimura〉1 "He began measuring the celestial directions as if he didn't notice me there. " Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information |
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〘名〙 天体観測の略。元来は、航海者が海上での自船の位置を知るため、六分儀などによって天体の方位や高度を測定することをいう。※海底旅行（1929）〈木村信児訳〉一「彼はわたしのゐるのに気がつかぬらしく天測(テンソク)を始めた」
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