Question

What is Prime - Meridian?​

Answer 1

a planet's meridian adopted as the zero of longitude.

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Answer 2

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What is Prime Meridian?

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The prime meridian is the line of 0 longitude, the starting point for measuring distance both east and west around the Earth. The prime meridian is arbitrary, meaning it could be chosen to be anywhere. Any line of longitude (a meridian) can serve as the 0 longitude line.

The prime meridian is the line that separates geographic east from west on the globe. And it's where time itself starts, being the site of the prime meridian, Greenwich Mean Time or degrees longitude, depending on what you prefer.

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