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- Dictionaryprime meridian
noun
- 1. a planet's meridian adopted as the zero of longitude.
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- Prime meridian
Line of longitude, at which longitude is defined to be 0°
A prime meridian is an arbitrarily chosen meridian 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 notational system). For Ear... Wikipedia
