NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2011 Jan 14, 09:41 -0800
Patrick,
I believe the d value you are referring to is the hourly change of declination. The minutes and seconds of time increments in the back of the Nautical Almanac will give you the fraction of the d value to add or subtract from the whole hour declination figure. For example if making an observation on the half hour then half of the 0.4' d value (-0.2') would be subtracted from the south declination on your January 14th date. During periods near the solstice the "d" value is small and conversely large near the equinox.
Greg Rudzinski
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