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By international agreement for roughly the last hundred years, the longitude through the Royal Observatory at Greenwich is accepted as the Prime Meridian, the zero point for measuring longitude. For precise measurement of the location of any place in the world, the location of the Prime Meridian must be precisely known. Therefore the Greenwich Observatory is important to geographers, who record all locations with reference, in part, to its distance from the Prime Meridian.
The royal observatory there was very important in its time, and many ideas that are known by everyone now were brainstormed by the royal geographers in the past, so it has been adopted as the 'home' of geographical mapping of the Earth..
It is 0 degrees longitude, the Prime Meridian.
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∙ 14y ago
Wiki User
∙ 9y agoThe Royal Observatory at Greenwich was established as the prime meridian in 1851. A prime meridian is a line of longitude, which is defined to be 0. The opposite is the 180 degree meridian, which divides the earth into the Western Hemisphere, and the Eastern Hemisphere.
Wiki User
∙ 12y agoBecause the lines of longitude are measured there that's where they start.
Other longitudes are East or West of Greenwich.
Wiki User
∙ 9y agoBecause the Prime Meridian (0 degrees longitude) runs through it.
Wiki User
∙ 9y agoIt was the place chosen as the Prime Meridian or 0 degrees longitude and the starting position of the time zones.
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