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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longhand Sight Reduction
From: Frank Reed
Date: 2014 Jun 10, 09:18 -0700
From: Frank Reed
Date: 2014 Jun 10, 09:18 -0700
Greg Rudzinski, you wrote:
Sin h = n - (n+m)a
n = Cos(L-d)
m = Cos(L+d)
a = haversine LHA
Very neat. And just a little reminder for those who don't have easy access to haversine tables... let's call them the "hav-nots"... the haversine of an angle θ is half of the versine of θ, and the versine is just 1-cos(θ). So hav(LHA)=[1-cos(LHA)]/2.
-FER
