NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Are higher altitude sights inherently less accurate?
From: Alexandre Eremenko
Date: 2012 May 2, 11:54 -0400
From: Alexandre Eremenko
Date: 2012 May 2, 11:54 -0400
Randal, Yes, there are more factors that can contribute to your errors with higher altitudes. One of them is the sextant arc imperfection. I've seen many sextant certificates on e-bay. In almost all cases when a certificate is available the arc errors increase towards the end of the arc. What sextant do you use? There is also a pure mathematical reason: it is harder to keep the sextant vertical by swinging the arc (I mean natural horizon). With artificial horizon it is even harder to align exactly, and to ensure that the sextant plane is vertical. Alex On Wed, 2 May 2012, Randall Morrow wrote: > > I have been loking at averages of my sights and higher altitudes seem to have larger intercepts. Using an AH and reading Hs of over 100 degrees, Ha over 50. It seems to take longer to find high altitude bodies in the mirror but is there something in the process which introduces more risk of error? > ---------------------------------------------------------------- > NavList message boards and member settings: www.fer3.com/NavList > Members may optionally receive posts by email. > To cancel email delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------------------- > > > > > : http://fer3.com/arc/m2.aspx?i=119343 > > >