proper motion

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الإنجليزية - الإنجليزية
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

    الواصلة

    prop·er mo·tion

    التركية النطق

    präpır mōşın

    النطق

    /ˈpräpər ˈmōsʜən/ /ˈprɑːpɜr ˈmoʊʃən/
المفضلات