LONGITUDE
longitude
(noun) the angular distance between a point on any meridian and the prime meridian at Greenwich
Source: WordNet® 3.1
Etymology
Noun
longitude (countable and uncountable, plural longitudes)
(geography) Angular distance measured west or east of the prime meridian.
(geography, astronomy) Any imaginary line perpendicular to the equator and part of a great circle passing through the North Pole and South Pole.
(archaic) Length.
Synonyms
• (half of a great circle): meridian
Source: Wiktionary
Lon"gi*tude, n. Etym: [F., fr. L. longitudo, fr. longus long.]
1. Length; measure or distance along the longest line; --
distinguished from breadth or thickness; as, the longitude of a room;
rare now, except in a humorous sense. Sir H. Wotton.
The longitude of their cloaks. Sir. W. Scott.
Mine [shadow] spindling into longitude immense. Cowper.
2. (Geog.)
Definition: 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; as,
that of New York is 74Âş or 4 h. 56 min. west of Greenwich.
3. (Astron.)
Definition: 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; as, the
longitude of Capella is 79Âş. Geocentric longitude (Astron.), the
longitude of a heavenly body as seen from the earth.
– Heliocentric longitude, the longitude of a heavenly body, as seen
from the sun's center.
– Longitude stars, 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.
Source: Webster’s Unabridged Dictionary 1913 Edition