proper motion

listen to the pronunciation of proper motion
Английский Язык - Турецкий язык
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Английский Язык - Английский Язык
The change in apparent position of a celestial body due to that body's velocity relative to the Sun
Apparent motion of a star across the celestial sphere at right angles to the observer's line of sight, generally measured in seconds of arc per year. Any radial motion (toward or away from the observer) is not included. Edmond Halley was the first to detect proper motions; the largest known is that of Barnard's star, about 10 seconds yearly
proper motion

    Расстановка переносов

    prop·er mo·tion

    Турецкое произношение

    präpır mōşın

    Произношение

    /ˈpräpər ˈmōsʜən/ /ˈprɑːpɜr ˈmoʊʃən/
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