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Meridian, or a meridian line may refer to:

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Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also Meridian

Contents

English

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Etymology

From Middle English < Old French < Latin meridianus (of or belonging to midday or to the south, southern) < meridies (midday, the south), orig. *medidies < medius (middle) + diēs (day).

Noun

Singular
meridian

Plural
meridians

meridian (plural meridians)

  1. An imaginary great circle on the Earth's surface, passing through the geographic poles.
  2. Either half of such a great circle, all points of which have the same longitude.
  3. (astronomy) A great circle passing through the poles of the celestial sphere and the zenith for a particular observer.
  4. (mathematics) A similar line on any general surface of revolution.
  5. Any of the longitudinal pathways on the body along which the acupuncture points are distributed.
  6. The highest point or state of consciousness and enlightenment achievable by a human.

Translations

Adjective

meridian

  1. Meridional; relating to a meridian.
  2. Relating to noon

External links

  • meridian in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
  • meridian in The Century Dictionary, The Century Co., New York, 1911
  • meridian at OneLook® Dictionary Search

Simple English

A meridian is an imaginary line of longitude drawn along the surface of the earth from the North Pole to the South Pole.

Geographers today measure these lines from what they call the Prime Meridian. It is the line of longitude that goes through the Royal Greenwich Observatory in Greenwich, England. They decided this at the 1884 International Meridian Conference.

Meridians, as lines of longitude, are measured in degrees. The Prime Meridian, as the starting point, is 0 (zero) degrees. Lines west of the Prime Meridian are either called west, as in "the longitude of Los Angeles, California is 118 degrees west", or as a negative number: "the longitude of Los Angeles, California is -118 degrees". Going the other direction, east of the Prime Meridian is always said as a positive number: "The longitude of Mecca is about 40 degrees east," or just "The longitude of Mecca is about 40 degrees."

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