A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert Bernecky
Date: 2018 Apr 30, 06:48 -0700
It would be helpful if you post the example you are working, and what step is not clear.
FYI, you can download these tables from
(select "publications" from their menu displayed on the left side, and then Sight Reduction Tables for Marine Navigation)
You can also find Vols 2 and 3 of the Air Sight Reduction Tables. Vol 1 of the Air Sight Reduction Tables is date dependent, and you can find them at
Of course, these days people probably use an app (if they do celestial at all).