prime meridian wikipedia - EAS

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    https://en.wikipedia.org/wiki/Prime_meridian

    A prime meridian is the 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 into two hemispheres. If

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    The notion of longitude for Greeks was developed by the Greek Eratosthenes (c. 276 – 195 BCE) in Alexandria, and Hipparchus (c. 190 – 120 BCE) in Rhodes, and applied to a large number of cities by the

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    As on the Earth, prime meridians must be arbitrarily defined. Often a landmark such as a crater is used; other times a prime meridian is defined by reference to another celestial object, or

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    • Burgess, Ebenezer (1860), "Translation of the Surya-Siddhanta", Journal of the American Oriental Society (e-book), vol. 6 (published 2013), p. 185

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    Since 1984, the international standard for the Earth's prime meridian is the IERS Reference Merdian. Between 1884 and 1984, the meridian of Greenwich was the world standard. These

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    1st meridian east – Meridian 1° east of Greenwich
    1st meridian west – Meridian 1° west of Greenwich
    180th meridian – Meridian 180° east or west of the Prime Meridian with which it forms a great circle

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  2. https://simple.wikipedia.org/wiki/Prime_Meridian

    The Prime Meridian is the meridian (line of longitude) that goes through the Royal Observatory, Greenwich in London it is also known as the International Meridian or Greenwich Meridian. …

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    • https://en.wikipedia.org/wiki/Prime_meridian_(Greenwich)

      The historic prime meridian or Greenwich meridian is a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. The modern IERS Reference Meridian widely used today is based on the Greenwich meridian, but differs slightly from it. The prime meridian was first established by Sir George Airy in 1851, and by 1884, over two-thirds of all ships …

    • https://en.wikipedia.org/wiki/Meridian_(geography)
      • In geography and geodesy, a meridian is the locus connecting points of equal longitude, which is the angle east or west of a given prime meridian. In other words, it is a line of longitude. The position of a point along the meridian is given by that longitude and its latitude, measured in angular degrees north or south of the Equator. On a Mercator...
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    • https://en.wikipedia.org/wiki/Meridian_(astronomy)

      In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location. Consequently, it contains also the north and south …

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      • Prime Meridian - GIS Wiki | The GIS Encyclopedia

        wiki.gis.com/wiki/index.php/Prime_meridian

        Mar 18, 2010 · Prime Meridian shown in red. The Prime Meridian is the meridian (line of longitude) at which the longitude is defined to be 0°. The Prime Meridian and its opposite the 180th meridian (at 180° longitude), which the International Date Line generally follows, form a great circle that divides the Earth into the Eastern and Western Hemispheres.

      • Prime meridian - Wikipedia @ WordDisk

        https://worddisk.com/wiki/Prime_Meridian

        A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at …

      • https://en.wikipedia.org/wiki/Principal_meridian

        In the United States Public Land Survey System, a principal meridian is the principal north-south line used for survey control in a large region, and which divides townships between east and …

      • https://en.wikipedia.org/wiki/IERS_Reference_Meridian

        36 rows · The IERS Reference Meridian ( IRM ), also called the International Reference Meridian, is the prime meridian (0° longitude) maintained by the International Earth Rotation and …

      • https://en.wikipedia.org/wiki/Paris_meridian

        The Paris meridian is a meridian line running through the Paris Observatory in Paris, France – now longitude 2°20′14.02500″ East. It was a long-standing rival to the Greenwich meridian as the …

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