NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Calibrating bubble sextants
From: Gary LaPook
Date: 2009 Dec 27, 14:20 -0800
From: Gary LaPook
Date: 2009 Dec 27, 14:20 -0800
TUC means"time of upper culmination." Of course the moon crosses your meridian approximately twelve hours later too. There are two upper culminations on November 2, 2010. http://www.cadastral.com/2010nov.htm gl Gary LaPook wrote: > For those who need to check the index error on their bubble sextants now > is a good time of the year to do it. I have written before recommending > the use of Polaris as it crosses the meridian since its altitude doesn't > change for a considerable period of time. At this time of the year > Polaris is on your meridian at the convenient hour of about eight p.m. > For more information see my prior posts at: > > http://groups.google.com/group/navlist/browse_thread/thread/524a9eca071d603c/8a202e27fa6c7216?hl=en > > Here is a link to a table of declination and GHA Polaris which includes > the last column (TUC) showing the time Polaris crosses the Greenwich > meridian. You can use it to calculate when it crosses your meridian. > > For December 2009: > http://www.cadastral.com/2009dec.htm > > For January 2010 and for the rest of 2010: > http://www.cadastral.com/2010jan.htm > > > gl > > -- NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com
