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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SUNSIGHT: free, open source TI-84 Plus program
From: Patrick Twohy
Date: 2026 Oct 13, 09:54 -0700
From: Patrick Twohy
Date: 2026 Oct 13, 09:54 -0700
Rob,
I tried this out after a friend pointed out your article. I plotted a sun shot two ways -- the traditional way via an AP with whole-degree of latitude/whole-degree of LHA, and with an AP at the DR position through your "app." Both yielded an identical LOP, which is excellent. I particularly appreciate that the math is necessarily different with the two methods. So the fact that the two LOPs are identical is either a very, very unlikely coincidence, or a suggestion that your method works just fine (at least for the sun shot I entered).
So, seems like a pretty good piece of work!
A shot of my plot is attached.
File:
