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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. This great circle divides a spheroid, like Earth, into two hemispheres: the Eastern ...
Jun 26, 2023 · The Prime Meridian is an imaginary line that divides the Earth into Eastern and Western Hemispheres. It is the longitude line with a value of 0 degrees and runs from the North Pole to the South Pole, passing through the Royal Observatory in Greenwich, London. The Prime Meridian has played a significant role in history and continues to have a ...
Greenwich meridian, an imaginary line, last established in 1851, used to indicate zero degrees longitude. It passes through Greenwich, London, and ends at the North and South poles. Because it indicated zero degrees longitude, it was also known as the prime meridian. It served as the internationally recognized prime meridian from 1884 to 1984, when it was superseded by the International Reference Meridian (IRM), which differs from it only slightly.
The 40th meridian, for example, has a longitude of 40° E or 40° W. See latitude and longitude. The prime meridian is zero degrees longitude and divides Earth into the Western and Eastern hemispheres. It is also known as the Greenwich Meridian because it passes through Greenwich, a borough of London, and terminates at the North and South poles.
- The Editors of Encyclopaedia Britannica
Oct 19, 2023 · The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around Earth. The prime meridian is arbitrary, meaning it could be chosen to be anywhere. Any line of longitude (a meridian) can serve as the 0° longitude line. However, there is an international agreement that the meridian that runs ...
A prime meridian, however, is the meridian chosen to be zero degrees longitude for common reference: the line from which all locations east and west can be measured. For centuries, people have chosen different meridians to be their prime meridian.
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The 0-degree line of longitude that passes through the Royal Observatory in Greenwich, England is the Greenwich Meridian. It’s also called the Prime Meridian. This line is the starting point for longitudinal lines that run north-south and converge at the poles. The Greenwich Meridian (or prime meridian) is a 0° line of longitude from which ...
