NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Correct way to calculate time of LAN?
From: Gary LaPook
Date: 2017 Feb 7, 05:49 +0000
From: David C <NoReply_DavidC@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, February 6, 2017 8:53 PM
Subject: [NavList] Re: Correct way to calculate time of LAN?
From: Gary LaPook
Date: 2017 Feb 7, 05:49 +0000
In east longitude just subtract the east longitude from 360 which makes it equivalent to west longitude. That is what you were doing with your method.
gl
From: David C <NoReply_DavidC@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, February 6, 2017 8:53 PM
Subject: [NavList] Re: Correct way to calculate time of LAN?
thenauticalalmanac methodGHA less than longitude is 173° 04' at 0630long - GHA = 2° 1.2'
I have solved the problem. The example given by thenauticalalmanac was for west long. I am in east long so the equation becomes long + GHA. Similarly the sign in "My Method" needs to be chosen depending on whether long is east or west.
