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right ascension
 
Noun right ascension has 2 senses
  1. right ascension, RA, celestial longitude - (astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
    --1 is a kind of angular distance
  2. right ascension - an arc of the celestial equator eastward from the vernal equinox
    --2 is a kind of     celestial equator, equinoctial circle, equinoctial line, equinoctial
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