proper motion

listen to the pronunciation of proper motion
English - Turkish
(yıldız) özdevinim
English - English
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

    Hyphenation

    prop·er mo·tion

    Turkish pronunciation

    präpır mōşın

    Pronunciation

    /ˈpräpər ˈmōsʜən/ /ˈprɑːpɜr ˈmoʊʃən/
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