noun. 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.

noun. Celestial longitude.

noun. Length; measure along the longest line.

noun. In geography, the angle at the pole contained between two meridians, one of which, called the first or prime meridian, passes through some conventional point from which the angle is measured.

noun. In astronomy, the arc of the ecliptic measured eastward from the vernal equinoctial point to the foot of the circle of latitude drawn through the object, as a star or other point on the sphere whose position is in question. See circle of latitudes, under circle.

noun. Length; measure or distance along the longest line; -- distinguished from breadth or thickness; ; rare now, except in a humorous sense.

noun. The arc or portion of the equator intersected between the meridian of a given place and the meridian of some other place from which longitude is reckoned, as from Greenwich, England, or sometimes from the capital of a country, as from Washington or Paris. The longitude of a place is expressed either in degrees or in time

noun. The distance in degrees, reckoned from the vernal equinox, on the ecliptic, to a circle at right angles to the ecliptic passing through the heavenly body whose longitude is designated.

noun. the longitude of a heavenly body as seen from the earth.

noun. the longitude of a heavenly body, as seen from the sun's center.

noun. certain stars whose position is known, and the data in regard to which are used in observations for finding the longitude, as by lunar distances.

noun. Angular distance measured west or east of the prime meridian.

noun. Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole.

noun. Length.

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

"Kerguelen himself only says that it is about 68° of E. longitude, _par_ 68° _de longitude_."