NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Corrections for latitude when taking sights
From: David Pike
Date: 2019 Mar 13, 01:29 -0700
From: David Pike
Date: 2019 Mar 13, 01:29 -0700
The watch time of sunrise/sunset, at a place 90° different in latitude from your own, gives the time when the Sun is due east or west of you at your own latitude. Prime Vertical, the best time to do time sights for longitude by chronometer, and reduce and simplify the wretched mathematics involved. Brian Walton
PS. I don't see how this could possibly work in the winter Brian, because when the Sun is rising in your opposite hemishere, it's still dark in your own. Similarly, when the Sun's setting in your opposite hemisphere, it has already set in your own. I'm fighting the urge to test this with 'Navigator'. Otherwise I'll never get this Appleyard Computer finished. DaveP
