英语词汇“proper motion”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	proper motion
释义	proper motion noun : the apparent change in position of a star usually expressed in seconds of arc per year that results from the projection on the celestial sphere of its motion with respect to the solar system — see tangential motion
随便看	ostracism ostracite ostracize ostracizer ostraco ostraco- ostracod ostracoda ostracodan ostracode ostracoderm ostracodermi ostracodous ostracoidea ostracon ostracophore ostracophori ostracophorous ostraeacea ostrakon ostrava close-tongued close to the wind closet queen close-up

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