Also known as: RA#, RA...
RA has various meanings in the Astronomy category. Discover the full forms, definitions, and usage contexts of RA in Astronomy.
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. Measurement of a heavenly body's distance from from First Point of Aries, and expressed in terms of sidereal time.
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