NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Longitude by Time Sight Using a Slide Rule
From: Greg Rudzinski
Date: 2012 Dec 14, 09:03 -0800
From: Greg Rudzinski
Date: 2012 Dec 14, 09:03 -0800
The K&E 10" has been dusted off to perform some time sights using the formula:
LHA(t)=ArcCos[ (SinHo ~ SindSinL) / (CosdCosL)
~ add if contrary name
~ subtract if same name
t = meridian angle
Ho = true altitude
d = declination
L = Latitude
This seems to be accurate enough. If Paul Hirose is watching then maybe he can do a slide rule accuracy analysis for the time sight using the 10".
Greg Rudzinski
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