NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lunars for dummies like me
From: Zorbec Legras
Date: 2004 Sep 24, 14:02 +0000
From: Zorbec Legras
Date: 2004 Sep 24, 14:02 +0000
----- Original Message ----- From: Jim ThompsonDate: Fri, 24 Sep 2004 08:30:25 -0300 To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Re: Lunars for dummies like me >But how did they convert the difference between LAN and LAT to a time for their ship's clock? In the French Navy they did it this way: 1? Take the local time at apparant sunrise from the ship's clock (Tvge) 2? Compute P for altitude = 0, with cos P = tan lat tan dec. (table 24 Friocourt) 3? 12 - p = local time Tvg 4? Tvg - Tvge = correction to apply to the ship's clock. The ship's clock was not used for nautical computations -- ___________________________________________________________ Sign-up for Ads Free at Mail.com http://promo.mail.com/adsfreejump.htm