NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Latitude by Lunar Distance
From: Alexandre Eremenko
Date: 2006 Oct 15, 13:06 -0400
From: Alexandre Eremenko
Date: 2006 Oct 15, 13:06 -0400
Dear Fred and Frank, > On Oct 5, 2006, at 11:01 PM, Frank Reed wrote: > > I have seen amateurs get 0.1 minute accuracy in lunars on the very > > first try. I have also seen this. For example, my own first try (posted on the old list 2 years ago). The question is whether one can achieve this RELIABLY and SYSTEMATICALLY. > > Of course, every once in a while my eyes will water or my hands will > > shake, and then it's as much as ten times worse. Do you know BEFORE the reduction and comparison with your true position that your hand shaked or eyes watered? Or you come to this conclusion AFTER you discover a 1' error? > ship around 1875. > The standard error was around 0.25', as I recall. I posted once (on the old list) statistics of many Russian observations from a ship (including Sun and star altitudes and star distances), all observations made by professionals, under various conditions, presumably with Russian sextants. (I can post this again, on the new list). My own observations are somewhat less accurate than those, especially in star distances, where I have more data. Alex. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
