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R: Re: Exercise #15 Day's Run (almost)
From: Federico Rossi
Date: 2008 Aug 10, 11:06 +0200
From: Federico Rossi
Date: 2008 Aug 10, 11:06 +0200
Jeremy, I've just worked the first part of the exercise, but I got to a slightly different result. In fact I use to define a running fix one which is derived from observations well spaced in time, e.g. a couple of hours before LAN, LAN and a couple of hours after LAN: in this case I assume the center of the (hopefully) small triangle formed by these three LOPs as being the Fix. In this case only one LOP is really spaced in time, i.e. the sun LOP of the morning, while LAN and moon LOP are only a few minutes apart, so I would rely on the latters to calculate the 1200 fix which is then 15deg 13.7' N 145deg 00.0' E. What do you think? Federico -----Messaggio originale----- Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto di Anabasis Inviato: gioved� 3 luglio 2008 16.29 A: NavList Oggetto: [NavList 5645] Re: Exercise #15 Day's Run (almost) Here are my numbers for the solution. Sorry it's been awhile, but I had to get off the ship then it's dealing with life after being missing for 4 months. 1200 Fix: Lat 15deg 13.9� N; Long 145deg 01.1� East. CMG 269.8deg Dist Run 35.8 nm, SMG 11.9 knots PM Azimuth: GE is 1.4Deg East, Dev 12.4 deg W Sunset/Star Time etc: Sunset 1853 ZT, Star Time 1915 ZT (0915 UTC). LHA Aries 182. Suitable stars from HO 249 Vol I are Alkaid, Alphecca, Antares, Acrux, Regulus, Pollux, and Dubhe. 1815 Sun/LAM Fix: is Lat 14 deg 55.4� N; Long 143 deg 59.2�E PM Amplitude: Deviation is 12.6 deg East 1900 S. Fix (stars only): Lat 14 deg 51.0� N; Long 144 deg 02.5� E Jeremy --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---