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I was an apprentice on deep sea vessels. Used to obtain a position fix by the stars twice a day, weather permitting, using a sextant. Satellite navigation was in its infancy at that time (one fix every eight hours on a good day and in the correct latitude).
Night time, the ship was darkened down using deadlights over the portholes, leaving only a dim glow from equipment on the Bridge and from the navigation lights. Middle of the ocean, perfect dark sky site (except that your platform kept moving).
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