NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longhand Sight Reduction
From: Francis Upchurch
Date: 2014 Nov 18, 22:56 -0800
From: Francis Upchurch
Date: 2014 Nov 18, 22:56 -0800
Thanks Hanno,
They look fine to me.Very clear and easy to use.Congratulations on all this.
If interested, see my recent postings on the Brown-Nassau graphic circular rule for LOPs. I think this may be faster than the Bygrave and apparently accurate to 2.6' of arc. Nobody seems to have seen one of these, so I guess I'll just have to try and make one from the limited information in the 2 papers. Do you or anyone else have the knowledge/skills/time to produce computer generated quadrant curves based on the basic spherical trig equations cited in the Brown paper?
If I cannot get those, I'll try to use the graphs from the paper. Perhaps they can be edited with photoshop or other graphic software? Can anybody out there help?
Best wishes
Francis
