longitude - meaning and definition. What is longitude
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What (who) is longitude - definition

GEOGRAPHIC COORDINATE THAT SPECIFIES THE EAST-WEST POSITION OF A POINT ON THE EARTH'S SURFACE
East longitude; Longitudes; Long.; Longatude; Zero Point of Longitude; Ls (astronomy); Longtitude; Meridian of longitude; Meridians of longitude; West longitude; Length of a degree of longitude; Longditude; Longitude determination; Astronomical longitude
  • parallels]]. The graticule shows the latitude and longitude of points on the surface. In this example, meridians are spaced at 6° intervals and parallels at 4° intervals.

longitude         
(longitudes)
The longitude of a place is its distance to the west or east of a line passing through Greenwich. Compare latitude
.
He noted the latitude and longitude, then made a mark on the admiralty chart.
N-VAR
Longitude is also an adjective.
A similar feature is found at 13 degrees North between 230 degrees and 250 degrees longitude.
ADJ: usu amount ADJ
longitude         
['l?n(d)??tju:d, 'l??g?-]
¦ noun the angular distance of a place east or west of a standard meridian, especially the Greenwich meridian.
Origin
ME: from L. longitudo, from longus 'long'.
longitude         
Distance east or west of the Greenwich meridian.

Wikipedia

Longitude

Longitude (, AU and UK also ) is a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians are imaginary semicircular lines running from pole to pole that connect points with the same longitude. The prime meridian defines 0° longitude; by convention the International Reference Meridian for the Earth passes near the Royal Observatory in Greenwich, south-east London on the island of Great Britain. Positive longitudes are east of the prime meridian, and negative ones are west.

Because of the Earth's rotation, there is a close connection between longitude and time measurement. Scientifically precise local time varies with longitude: a difference of 15° longitude corresponds to a one-hour difference in local time, due to the differing position in relation to the Sun. Comparing local time to an absolute measure of time allows longitude to be determined. Depending on the era, the absolute time might be obtained from a celestial event visible from both locations, such as a lunar eclipse, or from a time signal transmitted by telegraph or radio. The principle is straightforward, but in practice finding a reliable method of determining longitude took centuries and required the effort of some of the greatest scientific minds.

A location's north–south position along a meridian is given by its latitude, which is approximately the angle between the equatorial plane and the normal from the ground at that location.

Longitude is generally given using the geodetic normal or the gravity direction. The astronomical longitude can differ slightly from the ordinary longitude because of vertical deflection, small variations in Earth's gravitational field (see astronomical latitude).

Examples of use of longitude
1. Permission to reprint/republish Draw a few lines of longitude.
2. Longitude would not be established for another two centuries.
3. "We are at the right longitude to provide data," Brosch explained.
4. "Hey, vessel at such and such a latitude and longitude, this is the Iranian navy.
5. Smaller clouds actually lie upwind of the main cloud at zero degrees longitude, they note.