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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Why are NA sight reduction tables not
From: Alexandre Eremenko
Date: 2012 Apr 9, 18:06 -0400
From: Alexandre Eremenko
Date: 2012 Apr 9, 18:06 -0400
Yes, Imade two mistakes in copying the formula, the correct formula is sin A=(cos Dec sin LHA)/cos h. I apologize for this. Alex. On Mon, 9 Apr 2012, utf-8?Q?=C3=96rjan Sandstr=C3=B6m?= wrote: > > tried the formula " sin A=(cos Lat sin LHA)/cos h " repeatedly, got wrong answers all 4 "problems" on each calculator, one borrowed Casio CFx9850G and one TI-82 Stats I bought Saturday. > > To take one of the wrong answers. > when I plugged in > arcsin ((cos 64?41.4 sin 31?35')/cos 28?43.4') > got answer 14?47.5', correct answer was 216.2? according to USNO. > it seems impossible to get correct answer if I add or subtract 14?47.5' from any of the four cardinal points 90?, 180?, 270? or 360?. > > If I remove Lat and replace with Dec I get 36?16.3' which if added to 180 gives 216?16.3' which is close enogh for my navigation. > ---------------------------------------------------------------- > NavList message boards and member settings: www.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?i=118854 > > >