NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Bubble sextant collimation
From: Greg Rudzinski
Date: 2015 May 21, 07:47 -0700
From: Greg Rudzinski
Date: 2015 May 21, 07:47 -0700
Andres,
The eye will do the centering for you. Line up the visual center of the bubble with the visual center of the Sun side by side. This should provide results of between +/- 2' to 4' on an Hs observation. Determining index error will be a trick. Using Polaris as per LaPook method works very well for index error determination (explanation is somewhere in the archives).
Greg Rudzinski
P.S. I like practicing just sitting in the passenger seat of a parked car. If your sailboat is moored in a slip then practicing from the cockpit will work pretty good.
From: Andrés Ruiz
Date: 2015 May 21, 14:23 +0200I am aware how the real situation was during WW2, or is when flying.But asking the question otherwise, avoiding Coriolis, on a steady situation, on land, using the limb of the Sun:how do you make the observation?how do you align the bubble and the Sun? alternatives to the pictures.expected accuracy? with 2' or 1' of resolution in the vernier--
