A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Bedel
Date: 2020 Nov 3, 02:52 -0800
See a post on this forum by Stephen N. G. Davies about A. C. Johnson (2017 Jan 12, 10:34 +0800). It gives some interesting informations about Johnson's biography and the year of his birth (1828) and death (1909).
About the double chronometer method, see my own study on different Johnson's tables and books (page 19 in the attached file) ... written in french language but figures and formulae are international language !