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I’ve posted to this board a few times. My interest in bubble sextants / octants is related to the failed Amelia Earhart flight of 1937. I’ve done research to better understand the problems encountered in that flight.
I have read that the routine of celestial navigation at sea is to obtain a fix, on at least four celestial bodies at the brake of dawn. Then again at around brunch, then at high noon, and lastly near sunset. My question is how this routine differs with an instrument containing an artificial horizon? Are you able to obtain usable fixes at all hours of the night? A bubble sextant / or octant is very limited in the range of body altitudes that you can obtain?