NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2011 Apr 25, 14:05 -0700
Lu,
The horizon is the most available reference to use for determining index error but there is a certain amount of slop which is most noticeable if lets say ten readings of the horizon are recorded and compared. What I have been doing lately is placing solar film over the scope objective then observing the Sun directly without shades (this is done mostly so that the adjustment tool can be freely worked on the horizon mirror). Adding just a little side error helps separate images enough so that upper and lower limbs can be compared. Placing limbs tangent to each other on and off the arc works very well also.
Greg Rudzinski
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