出典:Wiktionary
right ascension (複数形 right ascensions)
Along with declination, right ascension determines the direction of a point on the celestial sphere in the equatorial coordinate system.
It is alternatively defined as the ascension (point on the celestial equator which rises with a specified celestial object) as seen from any point on the Earth's equator, where the celestial equator intersects the horizon at a right angle.
出典:Wikipedia
出典:『Wikipedia』 (2011/07/19 04:27 UTC 版)
Right ascension (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.