Right Ascension

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Right Ascension

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Angular distance east of the vernal equinox; the arc of the celestial equator, or the angle at the celestial pole, between the hour circle of a point on the celestial sphere, measured eastward from the hour circle of the vernal equinox through 24 hours. </dd>
Angular distance west of the vernal equinox, through 360 degrees, is sidereal hour angle. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use