NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Riddle of the Secant
From: Jacquelin Hardy
Date: 2026 Aug 10, 11:22 -0700
From: Jacquelin Hardy
Date: 2026 Aug 10, 11:22 -0700
As a young 2nd mate on a cargo ship, I used to take a sun amplitude and calculate the gyro error with the formula:
sin(Amplitude) = sin(declination) * secant(latitude)
And then an event happened and I stopped using the above formula and I used instead:
sin(Ampl.) = sin(declination) / cos(latitude)
What is this event ?
How old am I ?
Good luck
