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principal meridian

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principal meridian

One of the imaginary lines running north and south,used as references for the public land survey system. There are 37 principal meridians in the United States. Each one has a name, and the names are used to distinguish the various surveys that eventually made up the public land survey system.



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At that time a survey would happen and thus, in 1815 two men were hired to establish accurately the location of the base line and the principal meridian which are preserved by this marker.
Mixed astigmatism or irregular astigmatism describes the unequal curvature of the cornea in which one principal meridian is myopic and the other is hyperopic.
 
 
 
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