NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2013 Nov 11, 09:28 -0800
Francis,
Try doing a time sight using your Fuller cylinder rule and the formula:
Arc Cos{ ((Sin Ho) +/- (SinLSinD)) / (CosLCosD) = LHA (Meridian Angle)
rule:
Same Name (-)
Contrary Name (+)
Sum LHA(Meridian Angle) and GHA to get Longitude.
Greg Rudzinski
Re: Sight reduction method history
From: Francis Upchurch
Date: 2013 Nov 10, 22:28 -0800
Many thanks Greg, that is brilliant. I bet your deck is a lot warmer and drier place than mine is right now!I tend to prefer slide rules to tables, but will definitely gives these a try!
Francis
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