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Unformatted text preview: to 1 every 350 years. <Would the proper of stars affect what the constellations will look like in the future?> 2. Solar Motion The motion of the Sun with respect to the stars i. The direction toward which the Sun is moving is called the apex. ii. The direction the Sun came from is called the antapex. iii. 1 st measurement of solar motion was made by William Herschel in 1783 3. Radial Motion or Radial Velocity motion of a star towards or away form us. This motion causes a Doppler Shift in the light coming from a star. If a star is moving towards us the light from the star is shifted to the blue in of the electro-magnetic spectrum, if a star is moving away from us then the light from the star is shifted to the red end of the spectrum....
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- Fall '10