- 180th meridian
The 180th meridian or antimeridian is the meridian defined as 180° longitude. It is the line of
longitudeexactly opposite the Prime Meridian. It is common to both east longitude and west longitude. It is used as the basis for the International Date Linebecause it for the most part passes through the open waters of the Pacific Ocean. However, the meridian passes through a few countries as well as Antarctica.
Starting at the
North Poleand heading south to the South Pole, the 180th meridian passes through:
The meridian also passes between (but particularly close to) the
Gilbert Islandsand the Phoenix Islandsislands of KIR; between North Islandand the Kermadec Islandsof NZL; and between the Bounty Islandsand the Chatham Islands, also of NZL.
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