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 Apr 14, 08:27 -0700
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From: James N Wilson
Date: 2009 Apr 14, 08:27 -0700
Brad:
You wrote:
Jim - do you accept the conditions that are posted by George.
They are
1) 10% (1 knot in 10) velocity scatter
2) 1 arc minute in true altitude scatter
3) Centered around Noon (but not precisely so. We don't want the apex of the parabola to contain an altitude)
4) 13 values scattered in time. About 1/2 before and about 1/2 after LAN, with no periodicity (not every 5 minutes, some variation can be expected.
1) 10% (1 knot in 10) velocity scatter
2) 1 arc minute in true altitude scatter
3) Centered around Noon (but not precisely so. We don't want the apex of the parabola to contain an altitude)
4) 13 values scattered in time. About 1/2 before and about 1/2 after LAN, with no periodicity (not every 5 minutes, some variation can be expected.
Those are fine, but as I noted I am dependent on Nautical Almanac data, and
so I also need the 2008 date to get GHA. I can assume that it's December 24,
where the equation of time is close to zero and the declination is S23°24.3',
with d of -.1'. But there are enough assumptions already. I
would prefer the data in simple form, since finding an Excel program is a
chore.
Jim Wilson
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