NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Sight reduction via calculator
From: Peter Fogg
Date: 2006 May 3, 23:12 -0500
From: Peter Fogg
Date: 2006 May 3, 23:12 -0500
Guy
These are good formulae. Do have to be careful with signs (pos, neg).
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These are good formulae. Do have to be careful with signs (pos, neg).
A = Azimuth, clockwise
000º - 360º; d = declination, +N,
-S; l
= latitude, +N, -S;
t =
local hour angle 000º - 360º; h =
altitude
Altitude:
sin h = sin l sin d + cos l cos d cos t
Azimuth:
tan A = -sin t / tan d cos l - sin l cos
t
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