PRIMEMERIDIAN

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.

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prime meridian

Noun

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


The above text is a snippet from Wiktionary: prime meridian
and as such is available under the Creative Commons Attribution/Share-Alike License.

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