From Wikipedia, the free encyclopedia
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.
[1] When combined with
declination, these
astronomical coordinates specify the direction of a point on the
celestial sphere in the
equatorial coordinate system.
An old term,
right ascension (Latin,
ascensio recta[2]) refers to the
ascension, or the point on the celestial equator which rises with any celestial object, as seen from the
Earth's
equator, where the celestial equator intersects the
horizon at a
right angle. It is contrasted with
oblique ascension, the point on the celestial equator which rises with a celestial object as seen from almost anywhere else on
Earth, where the celestial equator intersects the
horizon at an
oblique angle.
[3]
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