NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Buying a sextant- a cautionary tale.
From: Alexandre Eremenko
Date: 2006 May 5, 11:30 -0400
From: Alexandre Eremenko
Date: 2006 May 5, 11:30 -0400
Bill, The small distances like that, Castor-Pollux and delta-zeta Orion are time independent. I mean refraction does not change them by more than 0'05 because the distances are small. Tell me the coordinates of delta, zeta Orion you used, and I will compare our calculations. (They are not in the Almanac, where did you get them from?) Alex On Thu, 4 May 2006, Bill wrote: > > Alex wrote: > > > I use two pairs, one is Castor-Pollux, 4d30'.3 apart, another > > delta-zeta Orion, 2d44'.2 apart. > > Alex > > For what date and time (local) did you calculate the delta-zeta Orion pair? > I tried it for today between 15 to 45 minutes after sunset (seems to get too > low after that) and wind up in the 2d 47.8' neighborhood. Can't find my > mistake. > > This is getting me crazy. Went to Omars site to pick up Hc's for delta-zeta > Orion. http://www.tecepe.com.br/scripts/AlmanacPagesISAPI.isa > > Using the Hipparcos Catalogue the closet star I could to delta Orion for > that SHA range and declination starting in Od was Mintaka. I could not see > a delta Orion on Omars site. > > I don't see anything matching Mintak's name or specifications in the > almanac. > > Anyone. What am I missing? > > Bill >
