A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2017 Sep 15, 16:56 -0700
Image 1. No sun filters shading the index mirror would suggest a high altitude moon observation.
(US Navy MK 3 with split horizon mirror)
Image 2. No sun filters shading the index mirror with index arm at or near zero would indicate an index error check using the horizon.
(Cassens & Plath with whole horizon mirror)
Image 3. Sun filters shading the index mirror with index arm near zero would indicate a low altitude observation of the Sun.
(Astra lllB with split horizon mirror)
As long as the bridge glass is flat there shouldn't be a refraction problem. No worse than stacking filters.
From: Dustin Baenen
Date: 2017 Sep 15, 14:59 -0700