| 单词 | right ascension |
| 释义 | right ascension in British Englishnoun astronomy the angular distance measured eastwards along the celestial equator from the vernal equinox to the point at which the celestial equator intersects a great circle passing through the celestial pole and the heavenly object in question Symbol: α. Compare declination (sense 1)right ascension in American English Astronomy 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 6) to find an exact position in the sky: abbrev. RA |
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