NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Direct methods
From: Dave Walden
Date: 2007 Nov 2, 14:43 -0700
From: Dave Walden
Date: 2007 Nov 2, 14:43 -0700
Nice catch by George! Declination can of course be
less than one degree North or South. The math works
for small declination; user interface doesn't. Quick
fix: If declination is less than one degree, enter
minutes as decimal degrees.
Revised version is attached which should fix the
problem more elegantly.
Has anyone followed the hint in the file name and
found:
James A. Van Allen, Basic principles of celestial
navigation, American Journal of Physics -- November
2004 -- Volume 72, Issue 11, pp. 1418-1424.
(Google to find online. Yes, THAT Van Allen!)
Test data from ICE:
Celestial Navigation Data for 2007 Mar 20 at
18 00 00 UT (GMT)
Delta T = 69.5 seconds
For Assumed Location: Longitude W
77 10.1
Latitude N
38 53.3
Almanac Data ³
Altitude Corrections
Object GHA Dec Hc Zn ³
Refr SD PA Sum
ø ' ø ' ø ' ø ³
' ' ' '
SUN 88 07.3 s 0 06.0 +49 44.2 197.1 ³
-.9 16.1 .1 15.3
MOON 67 52.4 n11 51.3 +61 43.8 160.5 ³
-.6 16.9 29.4 45.7
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File: 103744.vanallenfix_5.xls
