Prime meridian | Wikipedia audio article
Channel: wikipedia tts
Date: 14/12/2018

This is an audio version of the Wikipedia Article:
Prime meridian


00:00:55 1 History
00:05:27 2 List of prime meridians on Earth
00:05:38 3 International prime meridian
00:06:14 3.1 Prime meridian at Greenwich
00:07:58 3.2 IERS Reference Meridian
00:10:54 3.2.1 List of places
00:11:11 4 Prime meridian on other planetary bodies
00:13:23 5 See also
00:13:38 6 Notes
00:13:47 7 Citations
00:13:56 8 Works cited
00:15:20 9 External links



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SUMMARY
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A prime meridian is a meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its antimeridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides the sphere, e.g., Earth, into two hemispheres. If one uses directions of East and West from a defined prime meridian, then they can be called the Eastern Hemisphere and the Western Hemisphere.

A prime meridian is ultimately arbitrary, unlike an equator, which is determined by the axis of rotation—and various conventions have been used or advocated in different regions and throughout history. The most widely used modern meridian is the IERS Reference Meridian. It is derived but deviates slightly from the Greenwich Meridian, which was selected as an international standard in 1884.