A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Samuel L
Date: 2014 Nov 12, 04:18 -0800
I made an AH of Azek board plastic which has regular glass panes that are positioned at 45d, like a tent. The glass panes are sliding and removeable as they are in slots rabeted in the sides of the AH. The AH fluid is used Diesel motor oil in a plastic lid. The AH can be used in windy weather and works quite well.
For the past several days, not feeling like using the AH I made, we took Sun sights and star sights using a pond as the AH. It was windy for the Sun sights and the water rippled at you'd expect. When superimposing the Sun images intercepts were obtained within 5 miles of our GPS determined location. The same results were obtained with the star sights even though it wasn't as windy. The results of determining latitude using Polaris and HO 249 Table 6 got within a few seconds of Latitude.
The method used for superimposing the bodies image is what I refer to as "image approximation". That is; when it looks like the body is truly superimposed the time and Hs are recorded.
We've done so many sights this way and are quite pleased with the results. The only thing that's really accurate when taking sights this way is the time of my watch which is set to WWV.
When using the AH I made I'm curious to know why the majority of the fixes end up Northwest of my actual position?