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At dawn, the ship's navigator raised the almucantar staff to measure the sun's amplitude and correct the compass variation.
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At dawn, the ship's navigator raised the almucantar staff to measure the sun's amplitude and correct the compass variation.
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Related words
almucantar staff
Noun
Japanese Meaning
伝統的な古代の計測器具で、15度の弧を有し、かつて海上において日の出や日の入り時の太陽の振幅を観測することで、羅針盤の偏差を測定するために用いられていた器具
English - English
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