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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Out of Date Almanac
From: John Huth
Date: 2009 Dec 8, 15:01 -0500
I did the exercise of the simplest thing - solar declination by using a sinusoidal approximation. I then looked up two years of declination data and plotted the deviation from that - you can get down to perhaps a tenth or a couple of tenths of a degree by a mnemonic memorization on top of the sinusoidal approx. Definitely one of those life-rafty things.
Attached is a quick description and a couple of plots.
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From: John Huth
Date: 2009 Dec 8, 15:01 -0500
I did the exercise of the simplest thing - solar declination by using a sinusoidal approximation. I then looked up two years of declination data and plotted the deviation from that - you can get down to perhaps a tenth or a couple of tenths of a degree by a mnemonic memorization on top of the sinusoidal approx. Definitely one of those life-rafty things.
Attached is a quick description and a couple of plots.
--
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList+@fer3.com
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