Definitions for prime meridian

This page provides all possible meanings and translations of the word prime meridian

Princeton's WordNet

  1. prime meridian(noun)

    meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

Wiktionary

  1. prime meridian(Noun)

    The reference line at 0u00B0 longitude, passing through Greenwich, England, from which longitude east and west is measured.

Freebase

  1. Prime meridian

    A prime meridian is a meridian, i.e. a line of longitude, at which longitude is defined to be 0°. A prime meridian and its opposite in a 360°-system, the 180th meridian, form a great circle. This great circle divides the sphere, e.g. the Earth, into two hemispheres. If one uses directions of East and West from a defined prime meridian, then they can be called Eastern Hemisphere and Western Hemisphere. A prime meridian is ultimately arbitrary, unlike an equator, which is determined by the axis of rotation—and various conventions have been used or advocated in different regions and throughout history.


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