NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Buying a sextant- a cautionary tale.
From: Bill B
Date: 2006 Apr 30, 14:55 -0500
From: Bill B
Date: 2006 Apr 30, 14:55 -0500
Alex wrote > I use two pairs, one is Castor-Pollux, 4d30'.3 apart, another > delta-zeta Orion, 2d44'.2 apart. I use essentially the same method as > with the Sun: bring the pair together once on the arc, another time > off the arc. The average gives me (the negative of) IC, > and the difference twice the distance for control. My sextant permits > to measure up to -5d (off the arc). I am not clear about your method. Are you superimposing the point sources in a clockwise and anti-clockwise direction, or trying to achieve tangency (either in one direction or two directions of drum turns)? Either way, unless your IE is way of, I don't see how you can wind up off the arc with star-to-star angular differences in the 3d to 4d range. Bill
