the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians

the angular distance between an imaginary line around a heavenly body parallel to its equator and the equator itself

the angular distance between a point on any meridian and the prime meridian at Greenwich

(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere

(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

(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day