A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Oct 25, 16:17 -0700
This method uses and follows the same rules as the standard sin cos formula used with pocket trig calculators. It is the ideal pocket calculator backup table and does azimuth calculations more efficiently to the tenth of a degree. Azimuth, prime vertical, and amplitude can be quickly calculated with only addition and subtraction. The working table and wallet table compares in size to the haversine table. Since the Ageton Classic and the Haversine Doniol both work off the DR assumed position they can serve as a double check against each other. If Hc is the same with each reduction then chances are that the reduction tabulations were done correctly. NA lookups could still be in error though. I also like the fact that the Ageton Classic can be done in a single vertical column. Haversine Doniol is still the champion sight reduction for Hc reductions because there are no rules through 180° of meridian angle. I remain a fan of both these new SR methods.
From: John D. Howard
Date: 2015 Oct 25, 10:09 -0700