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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Butterfly Bris Prototype
From: Greg Rudzinski
Date: 2009 Jun 18, 13:23 -0700
From: Greg Rudzinski
Date: 2009 Jun 18, 13:23 -0700
The Butterfly Bris is a double simplified fixed angle whole horizon mini
sextant that provides two bright primary sun images and two dim secondary sun
images. A pair of Butterflies can fit in a 35mm film case just as the
original Bris can. I have selected a double waterproof 35mm film case which
holds the pair of Butterflies in one side and a folded 8"x11" photocopy of
the Pub.249 sun perpetual almanac and sight reduction formulas in the other
side.
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