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The International Date Line (IDL) is the line extending between the South and North Poles that is the boundary between one calendar day and the next. It passes through the Pacific Ocean , roughly following the 180.0° line of longitude and deviating to pass around some territories and island groups.
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.
The nautical date line is implied but not explicitly drawn on time zone maps. It follows the 180° meridian ... are located in international water at longitude 3°E ...
As there are 360 degrees in a circle, the meridian on the opposite side of the Earth from Greenwich, the antimeridian, forms the other half of a circle with the one through Greenwich, and is at 180° longitude near the International Date Line (with land mass and island deviations for boundary
A prime meridian is an arbitrarily chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle.
The International Date Line lies to the east of the Chathams, even though the islands lie east of 180° longitude. The Chathams observe their own time, which is 45 minutes ahead of New Zealand time , including during periods of daylight-saving time ; the Chatham Standard Time Zone is distinctive as one of very few that differ from others by a ...
With one exception (magnetic declination), they all depend on a common principle, which is to determine the time for an event or measurement and to compare it with the time at a different location. Longitude, being up to 180° east or west of a prime meridian, is mathematically related to time differences up to 12 hours by a factor of 15. Thus ...
The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. [1] From 1884 to 1974, the Greenwich meridian was the international standard prime meridian, used worldwide for