NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2025 Dec 20, 20:41 -0800
David I have not viewed the video you mentioned. As I read your post it seemed to me that you were describing a variant of Longitude by Equal Altitudes. It is a method described in the Admiralty Manual of Navigation (vol 1914 clause 131) and no doubt in other navigation books.
A few years I tried the method with little success. Before noon I took a sight noting the time and altitude. Then after noon I noted the time when the altitude was equal. I did not need to come back the next day to get latiude - I could if I had wanted to have done a meridian altude in between the two sights for longitude. The problem with the method is that you get only one chance for the second logitude sight. I recently posted a spreadsheet of variuos work forms in the Ageton thread.. Equal Altitude was one of the methods.
David C
