A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Lars Bergman
Date: 2017 Feb 10, 13:27 -0800
Sean, you wrote
"The "Kleines Logarithmisch-Trigonometrisches Handbuch" By Joseph Georg Böhm (1882) appears to give that figure", i.e. 8.87662. It is interesting to find that the 1870 edition of the same book gives 8.87661.
But I don't think Worsley used Böhm. More probably he used a table designed for nautical use, containing among other things altitude corrections and traverse tables.