NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2013 May 2, 23:21 -0700
You only found one book pre-1937 that mentions the approximate method for determining longitude by sunrise, that is Cugle because Dutton (1934 ed) does NOT show that method. Cugle is for marine navigation and doesn't recommend this method for flight navigation and it does not have the special refraction and dip tables necessary for use in flight. The NIF is after the Earhart flight and even the NIF says for EMERGENCY use. What kind of emergency? Well not fire or engine failure or a zillion other emergencies you might think of. The only emergency this applies to is lack of an octant because with an operable sextant you can get much more accurate position information. Noonan had an octant. Neither NIF nor Cugle use you method of computation. You have never produced any navigation manual or textbook that uses your computation method so you must take great
pride in developing such an original method. Of course, Noonan had never heard of it since you developed it many years after he was lost. --- On Thu, 5/2/13, h.a.c. van Asten <hac.vanasten@gmail.com> wrote:
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