Astron. the angular distance of the hour circle of a celestial body from the vernal equinox, measured eastward along the celestial equator and expressed in degrees (from 0 to 360) or, more commonly, in hours (from 0 to 24), minutes, and seconds: it is used with declination (sense ) to find an exact position in the sky: abbrev. RA
"right ascension." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/right-ascension>.
right ascension. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/right-ascension
The angular distance of a celestial body or point on the celestial sphere, measured eastward from the vernal equinox along the celestial equator to the hour circle of the body or point and expressed in degrees or hours.