NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Brad Morris
Date: 2013 Apr 25, 16:40 -0400
Hi Jeremy
I posses a very rare instrument indeed. Its a prismatic reflecting circle. This circle can measure angles from zero to 180 degrees. I realize that this is far beyond the capability of a normal sextant.
Brad
I think the first issue to be dealt with with large angle lunars is getting an instrument that will measure in excess of the 125 degrees of modern sextants.
Also limiting for useful lunars is the unknown refraction of low altitude bodies. Much below 15 degrees and measurements become a bit inaccurate. Okay maybe for position, but not so much for lunars in my way of thinking.
I would have to check my logs, but my largest angle lunar was about 122 degrees, and it was a bear to observe due to the mirror angles.
This past Sunday in Mystic, the sun and moon were at 127 degrees or so. I could see them both in my scope, but couldn't get them to meet. We were a day late I'm afraid.
Jeremy
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