prime meridian

The prime meridian is a reference line through Greenwich, England that measures longitude east and west.

(noun)

An example of prime meridian is zero degrees longitude.

See prime meridian in Webster's New World College Dictionary

the meridian from which longitude is measured both east and west; 0° longitude: it passes through Greenwich, England

See prime meridian in American Heritage Dictionary 4

noun

The zero meridian (0°), used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.

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prime meridian

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