The antemeridian is halfway around the world, at 180 degrees. It is the basis for the International Date Line. Half of the world, the Eastern Hemisphere, is measured in degrees east of the prime meridian. The other half, the Western Hemisphere, in degrees west of the prime meridian.
A prime meridian is an arbitrary meridian in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian shape a brilliant circle. This fantastic circle divides a spheroid, just like the Earth, into two hemispheres: the jap Hemisphere and the Western Hemisphere.
Are there 2 prime meridian?
The prime meridian is 0° longitude. The 180th meridian is the road of longitude this is exactly contrary the top meridian. It is 180° longitude.
Why Greenwich is prime meridian?
In 1884, the global Meridian conference passed off in Washington, D.C. to establish an the world over recognized single meridian. The meridian chosen was that which handed via the airy transit circle at Greenwich, and it have become the prime meridian of the arena.
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