A prime meridian is a meridian (a line of longitude) in a geographical coordinate system at which longitude is defined to be 0°. A prime meridian and its opposite in a 360°-system, the 180th meridian (at 180° longitude), form a great circle. This great circle divides the sphere, e.g., the Earth, into two hemispheres.
I thought it was just a fancy term for muting somebody who repeatedly posted the same boring thing on other people threads!!!
ps. not you by the way. : )
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