| NOUN | location | right ascension, RA, celestial longitude | (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 |
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| Meaning | (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 and seconds; used with declination to specify positions on the celestial sphere. | |
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| Example | "one hour of right ascension equals fifteen degrees" | |
| Synonyms | RA, celestial longitude | |
| Category | astronomy, uranology | The branch of physics that studies celestial bodies and the universe as a whole |
| Broader | angular distance | The angular separation between two objects as perceived by an observer |
| Spanish | AR, ascensión recta, longitud celeste | |
| Catalan | ascensió recta, longitud celeste | |
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