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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 timekeeping and navigation.
The meridian 15° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Africa, the Atlantic Ocean, ...
Meridian four blocks north of Old Naval Observatory, looking south in August 2005. [15]The third meridian was defined on September 28, 1850, by Congress: "[T]he meridian of the observatory at Washington shall be adopted and used as the American meridian for all astronomical purposes and ... the meridian of Greenwich shall be adopted for all nautical purposes."
The meridian 100° west of the Prime Meridian of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, North America, the Pacific Ocean, the Southern Ocean, and Antarctica to the South Pole. The 100th meridian west forms a great circle with the 80th meridian east.
The Meridian is the antipode of 168°45' West of Greenwich which runs through the Bering Strait and was proposed as a new date line. On Peters' world map the easternmost part of Asia and Russia is not displayed left of Alaska, as is usually done on Greenwich-centered maps, but on the right side as the rest of Russia and Asia. [citation needed]
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 meridian 90° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole. It is the border between two tropical cyclone basins : the Australian region and the Southwest Indian Ocean basin .
It is the most populous meridian in the Americas and the second most populous west of Greenwich, being home to between 30.3 million and 31.2 million people as of 2019. [1] In Antarctica, the meridian defines the western limit of the Argentinian territorial claim, and passes through the Chilean and British claims – the three claims overlap.