in the equatorial coordinate system, is the celestial equivalent of terrestrial longitude. It divides the celestial equator into 24 hours, each of 60 minutes.
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http://en.wikipedia.org/wiki/Glossary_of_astronomy
Right ascension (abbreviated RA; symbol α) is the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle of the point in question. When combined with declination, these astronomical coordinates specify the direction of a point on the celestial sphere in the equatorial coordinate system. An old te...
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http://en.wikipedia.org/wiki/Right_ascension
Angular Distance of a celestial object located east of the vernal equinox; outer space sphere equivalent to longitude.
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http://planetfacts.org/space-terms/
With declination, one of the coordinates used to designate the location of an object on the celestial sphere. Right ascension is measured in hours, minutes, and seconds and is similar to longitude on Earth.
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http://www.braeunig.us/space/glossary.htm
in astronomy, the east–west coordinate by which the position of a celestial body is ordinarily measured; more precisely, it is the angular distance ... [5 related articles]
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http://www.britannica.com/eb/a-z/r/49
(R.A.) One of two coordinates commonly used to define the position of an object in the sky, the other being declination. Right ascension is the equivalent of longitude on Earth but is measured in hours, minutes, and seconds from an arbitrary point which is taken as the intersect...
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http://www.daviddarling.info/encyclopedia/R/right_ascension.html
A coordinate which, along with declination, may be used to locate any position in the sky. Right ascension is analogous to longitude for locating positions on the Earth.
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The angular distance of a celestial object measured in hours, minutes, and seconds along the celestial equator eastward from the vernal equinox.
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In astronomy, the right ascension is the distance of a star or other heavenly body from the first point of Aries, or the point of intersection of the sun's path with the celestial equator. The right ascension, together with the declination of a star, fixes its position. Right ascension is stated in hours and minutes, fifteen degrees being equal to ...
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http://www.probertencyclopaedia.com/browse/AR.HTM
The amount of time that passes between the rising of Aries and another celestial object. Right ascension is one unit of measure for locating an object in the sky.
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http://www.seasky.org/astronomy/astronomy-glossary.html
The celestial equivalent of longitude, denoting how far (in 15°-wide `hours`) an object lies east of the Suns location during the March equinox.
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http://www.skyandtelescope.com/astronomy-terms/
[
n] - (astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body 2. [n] - an arc of the celestial equator eastward from the vernal equinox
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http://www.webdictionary.co.uk/definition.php?query=right%20ascension
RA noun (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes ...
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