Question

what is prime meridian​

Answer 1

Answer:

A prime meridian is the meridian in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian form a great circle. This great circle divides a spheroid into two hemispheres.

I hope this can help you

Answer 2

Explanation:

a planet's meridian adopted as Zero of longitude...

in short 0°longitude..