NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigation by the Moon
From: Alexandre Eremenko
Date: 2021 Mar 27, 17:11 +0000
From: Alexandre Eremenko
Date: 2021 Mar 27, 17:11 +0000
Geoff, I was trying to use the data which the master mate could possibly keep in his memory. This is the length of the tropical month (period of revolution of the Moon with respect to Sun). It is 29.53 days. Now 360 : 29.53=12.19 (degrees per day) = 0.81 (hour/per day) =48.6 (minutes per day) = approx 49 minutes. This is a plausible calculation for an educated master mate. But the calculation must start from some known distance on some known date, a date of a solar or lunar eclipse, for example. Alex.
