英语词汇“diurnal arc”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	diurnal arc
释义	WordReference Random House Unabridged Dictionary of American English © 2024 diur′nal arc′, [Astron.] Astronomythe portion of the diurnal circle that is above the horizon at a given point. Cf. nocturnal arc.
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