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...tude and longitude are measured in degrees, with the equator and the prime meridian serving as the zero point for each. The degrees are then divided into decim ...negative numbers for locations south of the equator and west of the prime meridian.

...graphy)|meridian]]s. The meridian passing through Greenwich is the [[Prime Meridian]]. Unlike parallels, all meridians are halves of great circles, and meridia

...idian Conference]] adopted the Greenwich meridian as the ''universal prime meridian'' or ''zero point of longitude''. ...defined politically, so their centers and boundaries often do not lie on [[meridian (astronomy)|meridians]] at multiples of 15°. In order to perform this ca

...by 1884 two-thirds of all charts and maps already used it as their [[Prime Meridian]]. In [[1929]] the term Universal Time (UT) was introduced to refer to GMT

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