NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Amplitudes
From: Greg Rudzinski
Date: 2010 Jun 3, 14:48 -0700
From: Greg Rudzinski
Date: 2010 Jun 3, 14:48 -0700
John,
My 1975 Bowditch vol. 2 explanation of table #27 shows on page 13 that Sin Amp = SEC Lat SIN Dec
I prefer to transform this formula to Amp = INV SIN (SIN Dec / COS Lat)
This looks to be symmetrical with results applied North/South of East/West depending on whether Latitude and Declination are the same or contrary in name.
GRudzinski
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