NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2012 Jun 6, 08:13 -0700
Obtaining a line of position using daytime Venus silhouetted by the Sun during a sunset TOV event became a possibility after looking at some of the TOV sunset images. The horizon to Venus pixel measurement required measuring on different exposure settings. Exposure was increased to show the horizon then decreased to show the Venus silhouette (see side by side images attached).
Pixels : 919
MOA/Pixel for 200 mm lens at small angles .0975'
Hs = .0975(919) = 1* 29.6'
UT 02:55:22 6/6/2012
Lat. 34* 10.4' N
Lon. 119* 14.1' W
Height of eye 12 ft.
Azimuth 297.1*
Intercept 1.5' away
This unique one of a kind celestial line of position was a very nice way to finish a special day :)
Greg Rudzinski
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