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The Indian meridian, in longitude 97° 14′ 30″ west from Greenwich, extends from Red River to the south boundary of Kansas, and, with the base line in latitude 34° 30′ north, governs the surveys in Oklahoma east of 100° west longitude from Greenwich (all of Oklahoma except the Oklahoma panhandle).
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
This 1988 BLM map depicts the principal meridians and baselines used for surveying states (colored) in the Public Land Survey System.. The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling.
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Among the elders throughout the small towns that are dotted along US 81 in Oklahoma, the sixth meridian is commonly known among the locals as the "Indian Meridian" but US 81 is not known as the "Indian Meridian Highway". The El Reno tornado in May 2013, the largest tornado ever at 2.6 mi wide, also crossed US 81. The Indian Meridan is located ...
The true meridian is the chord that goes from one pole to the other, passing through the observer, and is contrasted with the magnetic meridian, which goes through the magnetic poles and the observer. The true meridian can be found by careful astronomical observations, and the magnetic meridian is simply parallel to the compass needle.
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The division of Earth by the Equator and the prime meridian Map roughly depicting the Eastern and Western hemispheres. In geography and cartography, hemispheres of Earth are any division of the globe into two equal halves (hemispheres), typically divided into northern and southern halves by the Equator and into western and eastern halves by the Prime meridian.