英语词汇“parallactic instrument”的意思、释义、用法解释及翻译-春雷网

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词汇	parallactic instrument
释义	Definition of parallactic instrument in English: parallactic instrument noun historical An instrument invented by Ptolemy, consisting of three hinged rods (one vertical, one aligned along the observer's line of sight, and the third fixing the angle between the first two), used for calculating the parallax of the moon. Origin Late 17th century; earliest use found in Philosophical Transactions of the Royal Society of London. Definition of parallactic instrument in US English: parallactic instrument noun historical An instrument invented by Ptolemy, consisting of three hinged rods (one vertical, one aligned along the observer's line of sight, and the third fixing the angle between the first two), used for calculating the parallax of the moon. Origin Late 17th century; earliest use found in Philosophical Transactions of the Royal Society of London.
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