NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Latitude and longitude around noon
From: Francis Upchurch
Date: 2017 Mar 4, 14:52 -0000
From: Francis Upchurch
Date: 2017 Mar 4, 14:52 -0000
Hi Herman, Thanks for the email. Nautical Almanac (NA) 2nd March at time 17.00.00 gives sun GHA 71*59.5', NA increments for the extra 38 seconds gives + 9.5' =72*8.9' at assumed LAN of 17.00.38 This is quicker and easier than working out EoT and arc to time conversion. GHA sun has all that already done if LHA =0. I forgot to mention that this method is only as accurate as the estimated LAN. So a more accurate LAN estimate (perhaps from the graph or equal altitudes?) can then be used with this technique to give a better result? Frank or other sages, please correct me if I have all this wrong! Best wishes Francis -----Original Message----- From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Herman Dekker Sent: 04 March 2017 13:24 To: francisupchurch@gmail.com Subject: [NavList] Re: Latitude and longitude around noon Francis can you explain 17:00:00 = 71*59,1°, I cannot understand how you get that? 00:00:38 = 9,5', I can find in the arc to time conversion table. So pleace explain how quick and dirty works. Regards, HermanD [plain text auto-generated] ---------------------------------------------------------------- NavList message boards and member settings: http://fer3.com/NavList Members may optionally receive posts by email. To cancel email delivery, send a message to NoMail[at]fer3.com ---------------------------------------------------------------- ---------------------------------------------------------------- : http://fer3.com/arc/m2.aspx/Latitude-longitude-around-noon-Dekker-mar-2017-g38523
