NavList:

Lars,

Thanks for your feedback. I checked it and you are right, the form does not produce the correct azimuth. I must have messed it up somewhere.

I wrote: “If I get it right: it covers all angles of Lat, Dec and Ho, there are no angle-zones of reduced or questionable accuracy (e.x. in Ageton’s when K ≈ 90), it needs no whole-degree Lat or LHA, no interpolation is required, DR can be used as an Assumed Position is not necessary and there is no possibility of long intercept associated inaccuracies” and “why isn’t Guyou’s method considered the queen of the (abundant) compact tabular methods?”.

Well, I wish! The method apparently applies to the Time Sight, with all the limitations involved.
Anyhow, for anyone interested, I’m attaching some material explaining and commenting on the method:

• H. Bencker, “Chronological & Analytical List of Various Tables …” (Int. Hydrographic Review, 1943), pp 127-128
• A. Gougenheim, “Computation of the Fix at Sea by Means of Comm. Guyou’s Pocket Tables” (Int. Hydrographic Review, 1949), pp 99-106
• C. H. Cotter, “A History of Nautical Astronomical Tables”, 1974, pp 436-442
• P. Bedel, “Tables de Navigation 1840-1980” (Collection du Bureau des Longitudes, Vol. 5, 2020), pp 31-32 & 207-212 (in french)

Cheers,
Michalis Vaidanis

38°N 024°E

P.S.: Frank Reed, the attached material was retrieved from the web and I’m not sure if there is an issue of copyright infringement. Please feel free not to upload this post, or the attachments, in case you believe such an issue may arise.