celestial adj. 1.天的,天空的;天上的;天体的。 2.天国的;神圣的。 3.〔C-〕中国的,天朝的〔指封建时代的中国〕。 4.天体导航法的。 the C- City 【宗教】天国。 the C- Empire 天朝〔指封建时代的中国〕。 n. 1.天人,神仙。 2.〔C-〕(指封建时代的)中国人,天朝之人。 adv. -ly ,-ness n.
(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; "one hour of right ascension equals fifteen degrees" 同义词:right ascension, RA,