NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Exercise: Lower Transit
From: Antoine Cou�tte
Date: 2009 Sep 20, 11:08 -0700
From: Antoine Cou�tte
Date: 2009 Sep 20, 11:08 -0700
Sun 20 Sep 2009 Dear Jeremy, Given the information that Kochab is at lower culmination, we just need to know both Kochab Declination and Kochab geocentric altitude. For geocentric altitude I find 15�54.57' (you might a slightly different value since I can not figure out what you mean by " Temp/pressure correction is +.2 ". Declination is equal to 74�07.08'; When we combine both, we get an observed Latitude at Kochab transit time (04:09:44) equal to : N3128.7 (31�28.7'). Since you request it Latitude 04:09 LT, we need to correct for change in Latitude given the Ship's N/S CMG/SMG and I would then suggest that the observed Latitude at 04:09 LRT is N3128.6 (31�28'6) Best Regards Antoine M. "Kermit" Couette PS : True ! Lower transits are quite rare. I shot only 2 in many years at sea and they were "Full Local Apparent Noons", one with DENEB, and the second with RIGIL KENT if I remeber well. I need to dig out in my Celestial Navigation Logbooks and I will shortly publish both, ... just in your Honor !!! --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
