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What is a prime meridian and what does it do

User Krosenvold
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The Prime Meridian is the meridian (line of longitude) that goes through the Royal Observatory, Greenwich in London.

User Brain Foo Long
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The answer to your question is,

A prime meridian is a meridian in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its antimeridian form a great circle. This great circle divides the sphere, e.g., Earth, into two hemispheres.

-Mabel <3

User Ryanday
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