A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Greg Rudzinski
Date: 2017 Oct 3, 12:16 -0700
The CN navigator needs knowledge of azimuths to choose optimal stars with the best case being three bodies each differing by 120° in azimuth. The purpose of this is to cancel out systematic errors. The next best choice would be two bodies seperated by 90° of azimuth. This will not cancel out systematic errors but will make the error ellipse a perfect circle. The best tool for selecting stars would be a star finder. Using a star finder requires knowledge of approximate latitude to select the right template. What you can do is choose three stars that are visible to the navigator but not optimal to calculate an approximate position then use USNO,Pub 249 or a star finder to select stars.
From: Tony Oz
Date: 2017 Oct 3, 02:12 -0700