A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding
From: Greg Rudzinski
Date: 2017 Nov 6, 09:27 -0800
This calibration image is taken with the 35mm prime super takumar. The #4 Bris reflection has the upper limb Hs just about exactly zero from an 8ft. height of eye.
Lat 34° 10.5 N Lon 119° 14.1 W
Hs work out backwards to 15° 36' for reflection #4 on this homemade Bris sextant.