NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Wobbly Prime Meridian
From: Gary LaPook
Date: 2010 Nov 23, 01:23 -0800
From: Gary LaPook
Date: 2010 Nov 23, 01:23 -0800
To be really exact about this discussion, one minute of longitude at the equator is equal to the one "geographical mile" of 6,087 feet, 1,855 meters. Multiplying this by the cosine of the latitude of Greenwich makes one minute of longitude at that location 3791 feet (1155.5 meters) long. The GPS discrepancy of .088' makes it 333.6 feet, 101.7 meters.
gl
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