NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Lat/Lon by "Noon Sun" & The Noon Fix PROVE IT
From: Gary LaPook
Date: 2009 Apr 16, 13:14 -0700
From: Gary LaPook
Date: 2009 Apr 16, 13:14 -0700
When I was taking many series of sights to test the accuracy of a mercury artificial horizon I turned on my short wave radio tuned to WWVH. I took sights every minute on the minute. At the commencement of the spoken time announcement, which starts fifteen seconds before the minute, I picked up the sextant and followed the sun stopping at the on the minute tone. I then wrote down the time and the measured altitude and put the sextant down to avoid fatigue. It was easy to take a series of twenty sights in twenty minutes using this technique. gl On Apr 16, 7:13�pm, Thomas Kleemannwrote: > George Huxtable schrieb: > > > �Can a skilled observer take timed > > altitude readings as close as 1 minute intervals, though? Can he do so > > without an assistant for noting times and recording results? If not, we > > should be told, because it becomes a disadvantage in the procedure. > > Yes, he can. > > When I took series of observations to test if the precision of my Davies > Mk15 decreases under hot sunny conditions, I preset the Sextant to small > changes �in altitude and got observations spaced as close together as > about 45 to 50 seconds. > > Although it is quicker to note this obs with the time only instead of > time/altitude pairs, I understand it is the same with the timed obs at > the decreasing slope (because one already noted the altitudes when they > were increasing). > > Regards, > � � � � Thomas. --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---