Definitions for prime meridian

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

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  1. prime meridian(noun)

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

WiktionaryRate this definition:(0.00 / 0 votes)

  1. prime meridian(Noun)

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

FreebaseRate this definition:(0.00 / 0 votes)

  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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