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Prime me·rid·i·an

/prīm məˈridēən/

noun
- 1. a planet's meridian adopted as the zero of longitude.
- ▪ the earth's zero of longitude, which by convention passes through Greenwich, England.
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Prime meridian
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Line of longitude, at which longitude is defined to be 0°
A prime meridian is an arbitrarily-chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides a spheroid, like Earth, into two hemispheres: the Eastern Hemisphere and the Western Hemisphere (for an east-west notat... Wikipedia
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- define prime meridian in geography
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