180th meridian

A map of the Earth with the Pacific Ocean in the centre, with a vertical red line running the full height just west of the Bering Strait and east of New Zealand.
The 180th meridian on the map of Earth.
The International Date Line zigzags around the 180th Meridian.

The 180th meridian or antimeridian[1] is the meridian 180° both east and west of the prime meridian in a geographical coordinate system. The longitude at this line can be given as either east or west. On Earth, the prime and 180th meridians form a great ellipse that divides the planet into the Western and Eastern Hemispheres.

  1. ^ The word antimeridian can also mean the meridian opposite to any given meridian. E.g. 20° west is the antimeridian of 160° east.

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