NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Accuracy: main shades vs eyepiece shades?
From: Robert VanderPol II
Date: 2019 Jul 26, 18:33 -0700
From: Robert VanderPol II
Date: 2019 Jul 26, 18:33 -0700
Or use the USNO website for it.
https://www.usno.navy.mil/USNO/astronomical-applications/data-services/cel-nav-data/
Re: Accuracy: main shades vs eyepiece shades?
From: Frank Reed
Date: 2019 Jul 25, 19:54 -0700. . . .
Then compare those altitudes with expected values. And how do you get those expected altitudes? Well, you get your exact observing location from GPS, you get the exact time from GPS, then you do a reverse calculation from proper ephemeris data and other details, like your exact height of eye, to calculate what the sextant altitude should be. Sounds like a lot of work, right? .. . .
