180th meridian

"Anti-Meridian" redirects here. For the Brave Saint Saturn album, see Brave Saint Saturn § Discography.

Not to be confused with ante meridiem (AM), the time before midday, for which see 12-hour clock.

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.

The 180th meridian on a map of Earth.

The International Date Line zigzags around the 180th Meridian.

On Earth, the prime and 180th meridians form a great circle that divides the planet into the Western and Eastern Hemispheres. The antimeridian passes mostly through the open waters of the Pacific Ocean but also runs across land in Russia, Fiji, and Antarctica. An important function of this meridian is its use as the basis for the International Date Line, which snakes around national borders to maintain date consistency within the territories of Russia, the United States, Kiribati, Fiji and New Zealand.

Starting at the North Pole of the Earth and heading south to the South Pole, the 180th meridian passes through:

Co-ordinates (approximate)	Country, territory or sea	Notes
90°0′N 180°0′E	Arctic Ocean	North Pole
71°32′N 180°0′E	Russia	Chukotka Autonomous Okrug — Wrangel Island
70°58′N 180°0′E	Chukchi Sea
68°59′N 180°0′E	Russia	Chukotka Autonomous Okrug
65°02′N 180°0′E	Bering Sea
52°0′N 180°0′E	Amchitka Pass	Passing just east of Semisopochnoi Island, Alaska,  United States (at 51°57′N 179°47′E)
51°0′N 180°0′E	Pacific Ocean	Passing just east of Nukulaelae atoll,  Tuvalu (at 9°25′S 179°52′E) Passing just west of the island of Cikobia-i-Lau,  Fiji (at 15°43′S 179°59′W)
16°9′S 180°0′E	Fiji	Islands of Vanua Levu, Rabi, and Taveuni
16°59′S 180°0′E	Pacific Ocean	Passing just east of the island of Moala,  Fiji (at 18°33′S 179°57′E) Passing just west of the island of Totoya,  Fiji (at 19°0′S 179°52′W) Passing just east of the island of Matuku,  Fiji (at 19°10′S 179°47′E)
60°0′S 180°0′E	Southern Ocean
78°13′S 180°0′E	Antarctica	Ross Dependency, claimed by  New Zealand
90°0′S 180°0′E	Antarctica	Amundsen–Scott South Pole Station, South Pole

180° Meridian, Taveuni, Fiji. The man pictured is facing southward.

The meridian also passes between (but not particularly close to):

• through the Aleutian Island chain of US territory
• the Gilbert Islands and the Phoenix Islands of Kiribati
• North Island and the Kermadec Islands of New Zealand
• the Bounty Islands and the Chatham Islands, also of New Zealand

The only places where roads cross this meridian are in Fiji and Russia. Fiji has several such roads and some buildings very close to it. Russia has three roads in the Chukotka Autonomous Okrug.

Software representation problems

Many geographic software libraries or data formats project the world to a rectangle; very often this rectangle is split exactly at the 180th meridian. This often makes it non-trivial to do simple tasks (like representing an area, or a line) over the 180th meridian. Some examples:

• The GeoJSON specification strongly suggests splitting geometries so that neither of their parts cross the antimeridian.^[2]
• In OpenStreetMap, areas (like the boundary of Russia) are split at the 180th meridian.
• QGIS may present lines and polygons in a wrapped way if they cross the 180 meridian.

See also

• 179th meridian east
• 179th meridian west
• Prime meridian
• International Date Line

Notes

1. The word antimeridian can also mean the meridian opposite to any given meridian. E.g. 20° west is the antimeridian of 160° east.
2. Butler, H.; Daly, M.; Doyle, A.; Gillies, S.; Hagen, S.; Schaub, T. (2016). RFC 7946 – The GeoJSON Format. sec. 3.1.9. doi:10.17487/RFC7946. RFC 7946.