[right ascension] n (15c): the arc of the celestial equator between the vernal equinox and the point where the hour circle through the given body intersects the equator reckoned eastward commonly in terms of the corresponding interval of sidereal time in hours, minutes, and seconds
RIGHT ASCENSION
Meaning of RIGHT ASCENSION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012