Well, I am interested in celestial navigation as it relates to the abortive Amelia Earhart World Flight of 1937. If you’ve read my previous posts [above], you know where I am coming from. Your post answered my question about bubble-octants / sextants in that they can be used at night, but can they be used throughout the entire dark of night? Can the traditional aeronautical and maritime almanacs & reduction tables be used with sites taken at any time in the dead-of-night with a bubble-octant/sextant?
I did a quick google search for Mark V sextants… and is yours as heavy to hold as I read they were?
By-the-way, ‘Mark V’ was also the designation for the “new-improved” version of the standardized Navy deep-sea “hard-hat” diving helmets that were in use for generations.