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morning star,planet that becomes visible in the western sky shortly after sunset or in the eastern sky shortly before sunrise. It can usually be seen in twilight, when it is too light for the true stars to be seen. Venus and Mercury are often seen as evening or morning stars. Other planets, especially Mars and Jupiter, may appear as evening or morning stars at certain points in their orbits.
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evening starAn informal name for Venus when it lies east of the Sun and is a brilliant object in the western sky after sunset. Such periods of visibility follow superior conjunction and precede inferior conjunction. The term is sometimes applied loosely to evening visibility of Mercury or other planets.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
evening star[¦ev·niŋ ′stär]
A misnomer for a planet that can be seen without a telescope when it sets after the sun.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
a planet, usually Venus, seen just after sunset during the time that the planet is east of the sun
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005