
NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Peter Mackenzie
Date: 2025 Jan 21, 07:49 -0800
Thank you Frank and Alexandre.
I think I have sorted it - except for one odd issue. I have discovered the cause of the two separated sun images (see photo 1 in my previous post) (ie: despite fixing side and index error whilst focussing on a distant horizon object, I would still see two separated sun images when I moved the sextant up to the sun and placed the shades on both mirrors. micrometer set to zero). When I look at the sun, with only ONE of either of my two horizon mirrors, the image I see is of only 1 sun - with no side or index error. however, if I use BOTH my horizon mirrors, I see two sun images separated as shown in my Photo 1. I assume this is some odd prism effect of using 2 shades. i guess the solution is to only use 1 horizon shade...
Thank you for your patience