NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longitude from Local Apparent Noon Altitudes
From: Frank Reed
Date: 2012 Aug 19, 08:56 -0700
From: Frank Reed
Date: 2012 Aug 19, 08:56 -0700
John H., you wrote:
"Most of the precision in a longitude measurement in the equal altitude method comes from readings when the altitude is changing rapidly."
Actually, John, for a dozen altitudes taken within 45 minutes of noon, you can get quite an accurate longitude. And the correction for the changing declination and/or the motion of the observer is simpler. You should try it.
-FER
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