NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lat/Lon by "Noon Sun" & The Noon Fix PROVE IT
From: James N Wilson
Date: 2009 May 4, 13:53 -0700
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From: James N Wilson
Date: 2009 May 4, 13:53 -0700
Brad:
I've applied 20/20 hindsight and have again uttered, "Why didn't I think of
this before?"
I have blindly applied the sight taking rules for the equal altitude
method, where the object is to determine the time of highest altitude. But
that time is no longer needed. So, for "Unequal Altitudes" the two sets of
altitude measurements should be centered around meridian transit. Then I have to
accommodate George's Paradox: DWT is needed to get the time of transit, and the time of
transit is needed to get DWT. I propose to use the time of transit estimated from
the DR Longitude to schedule the sight takings and to get DWT, and then use that data to
get the more accurate time of transit. Much simpler. And I no longer have to sin
by extrapolating.
Historian Arnold Toynbee observed that creativity is enhanced by "The right
amount of hardship." Thank you George for providing that right amount of
hardship--not so much that the task is impossible, but enough to jar me loose
from my complacent ignorance.
Now, I have to re-write the damn book. A nuisance.
Jim Wilson
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