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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2014 Sep 13, 08:49 -0700
Sam,
Using the Pub 249 long term almanac is not the best way to get your values . Use the Nautical Almanac increments and corrections. See attached PDF Increments and corrections that goes with 2014 Nautical Almanac.
Here's what you should get for the Sun on 9/12/2014:
18 hours UT 90° 57.0' GHA declination 4° 00.0' N (d - 1.0') hourly change value found at bottom of Sun GHA colume
29 min. 31 sec. + 7° 22.7' ( -0.5' ) d correction value from increments and corrections page
GHA total 98° 19.7' dec. total 3° 59.5' N
30 min. 40 sec. + 7° 40.0'
GHA total 98° 37.0' dec. total 3° 59.5' N
You may be better off working with an actual Nautical Almanac first (which has instructions for use) before using the PDF's
Greg Rudzinski
