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...All Revisions 8+ and the Windows release have been fixed.
This Python TK application calculates a good set of stars for a 3 star fix, makes all calculations similar to the FAAs Celestial Computation Sheet (see FAA doc FAA-H-8083-18).
Also, you can create a PDF file that generates Pub 249 Vol 1 for any epoch you specify.
The PUB249 as PDF is found under "Files".
I wrote this for my aircraft bubble octant :-)
It is mainly useful for air navigation as it assumes a bubble sextant but may be used for normal sextants as well.
Requires Ephem and ReportLab (optional for PDF output)
Not to be used for real-world navigation!
Radial-velocity & transits analysis tool for exoplanets
...Baluev 2018, Astronomy & Computing, V. 25, P. 221 (update 3.0).
The technical manual explaining the details of the practical use is available in the download archive here (see the /doc/ subfolder).