![]() Many years later around the 19th century there were still concerns of the prime meridian. This prime meridian was used to provide measurement of the earth, but had many problems because of the lack of latitude measurement. The first prime meridian was set by Eratosthenes in 200 BCE. The length of a meridian on a modern ellipsoid model of Earth ( WGS 84) has been estimated as 20,003.93 km (12,429.87 mi). A meridian is half of a great circle on Earth's surface. On a Mercator projection or on a Gall-Peters projection, each meridian is perpendicular to all circles of latitude. 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. In other words, it is a line of longitude. ![]() In geography and geodesy, a meridian is the locus connecting points of equal longitude, which is the angle (in degrees or other units) east or west of a given prime meridian (currently, the IERS Reference Meridian). Meridians run between the North and South poles. JSTOR ( July 2018) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Meridian" geography – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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