NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2014 Feb 1, 09:13 -0800
The attached is a morning artificial horizon observation of the Sun using a DSLR 50mm equipped with microscope slide Bris reflector. From left to right is #8 reflected Sun, artificial horizon direct Sun (blue), #7 reflected Sun, and #6 reflected Sun.
For those who would like a go at reduction:
UT 13:36:20 1 Feb 2014
aLat 27° 41.1' N
aLon 80° 24.0' W
Sun dia. 32.46'
#8 Sun reflection 36° 2'
#7 Sun reflection 32° 23'
Divide total measurement by 2 to get Hs. Measure Sun center to Sun center rather than from the limb because of the elongated reflected images. Measuring with a millimeter rule on a zoomed image should be good enough (2'-3')or count pixels.
Greg Rudzinski
P.S. Very happy with my new photoshop (Lightroom 5) software which works with raw images.
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