Longitude (Topical Term)

Academic Press dict. of sci. tech., via WWW, Jan. 3, 2002 (longitude: Geography. A distance either east or west on the earth's surface, measured and expressed as the angle between a given meridian and a reference meridian (usually the prime meridian of Greenwich, England); sometimes measured as a linear distance; Astronomy. See celestial longitude. Engineering. In surveying, the east-west component of a traverse course.)

Amer. Herit. dict. (longitude: 1. Angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees (or hours), minutes, and seconds. 2. Celestial longitude)

McGraw-Hill dict. sci. tech. terms (longitude: Angular distance, along the Equator, between the meridian passing through a position and, usually, the meridian of Greenwich)