A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2021 Dec 20, 14:52 -0800
I am willing to bet that Jack London was trying to mark the exact time of LAN for longitude with a single observation rather than splitting the difference of times of equal altitudes before and after LAN. Since the Sun hangs for several minutes around LAN then a degree or two of longitude uncertainty would not be surprising. This may account for the unexpected 80 NM difference in position vs. DR by Log that he describes.