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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: running fix + lunar
From: Andrés Ruiz
Date: 2010 Nov 23, 12:11 +0100
From: Andrés Ruiz
Date: 2010 Nov 23, 12:11 +0100
For the altitude, an analytical expression of the partial derivatives can be obtained:
sin H = sin Dec sin B + cos Dec cos B cos(GHA+L)
dH = ∂H/∂B dB + ∂H/∂L dL + ∂H/∂t dt
dH = Ho - H = Ho - asin( sin Dec sin B + cos Dec cos B cos(GHA+L) )
cos H ∂H/∂B = sin Dec cos B - cos Dec sin B cos(GHA+L)
cos H ∂H/∂L = - cos Dec cos B sin(GHA+L)
∂H/∂t = (Hi+1 - Hi)/(ti+1 - ti)
regards
--
Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
