NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Online sight reduction and a question to Frank
From: Alexandre Eremenko
Date: 2012 Mar 19, 21:01 -0400
From: Alexandre Eremenko
Date: 2012 Mar 19, 21:01 -0400
Thanks, Gary. Very convenient. I had to reduce about 30 sights, see my next message:-) Alex On Mon, 19 Mar 2012, Gary LaPook wrote: > > Try this link: > > http://aa.usno.navy.mil/data/docs/celnavtable.php > > gl > > --- On Mon, 3/19/12, Alexandre Eremenkowrote: > > From: Alexandre Eremenko > Subject: [NavList] Online sight reduction and a question to Frank > To: NavList---org > Date: Monday, March 19, 2012, 3:28 PM > > 1. Does there exist a free online sight reduction calculator? > Of the type Frank has for the Lunars. > You input GMT, Long and Lat, and it gives you the Sun altitude. > I remember such things existed in the past...2. Question to Frank: I tried to use your calculator for this purpose. > It indeed computes the altitude. I input some random Lunar distance, > I only need Sun's or Venus's altitude. > Is this for the center of the Sun/Venus with no refraction correction? > Or what? And is the accuracy of this altitude 0'1 for the present time (2012)?I tried to reduce one or two altitudes manually, the result disagrees > with Frank's calculator altitude by few minutes.Alex. > ---------------------------------------------------------------- > 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=118403 > > >