A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2016 Jun 17, 10:50 -0700
I was wondering why you had said towards (-;
I now get 19° 09' for Hc from both 3270 and the cosine formula. 486 gives me 19° 08.7'. In the cosine formula I was using the assumed position for the cos data and the actual position for the sin data (or vice versa). Once I realised my error I quickly had the correct answer.
I have made more progress in the past few days than in the 40+ years since I purchased the sextant. I can now look forward to putting my copy of Norie to good use, working the sight with the haversine formula and the A-K short method (Ogura).