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| Description: The actual velocity of a star (or other object) can be separated into radial and transverse motions. The speed of the star toward or away from Earth in km/hr is its radial velocity. This motion creates a Doppler shift in the star’s spectrum. The speed in km/hr perpendicular to the radial velocity is called its transverse velocity, which does not affect the star’s spectrum. The angular motion of the star across the celestial sphere (that is, in the direction of its transverse velocity) is called proper motion Picture Stats: Views: 661 Filesize: 95.7kB Height: 900 Width: 1193 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15935 |