Longitude — the angular distance of a place east or west of the meridian at Greenwich, England, or west of the standard meridian of a celestial object, usually expressed in degrees and minutes. "at a longitude of 2° W"
Latitude — the angular distance of a place north or south of the earth's equator, or of a celestial object north or south of the celestial equator, usually expressed in degrees and minutes. "at a latitude of 51° N"More Informations.
Meridians — a circle of constant longitude passing through a given place on the earth's surface and the terrestrial poles.