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Right ascension

noun

Noun

1
The angular distance east of the vernal point (“the solar zenith at the March equinox”); the celestial equivalent of longitude.
"The sun's right ascension in time is useful to the practical astronomer in regular observatories, who adjusts his clock by sidereal time."
2
(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 wordnet

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