> Perhaps it uses just the one star, the Sun, at daytime+clouds. For marine celestial navigation, there are fifty-eight stars that are regularly used / have be

> Perhaps it uses just the one star, the Sun, at daytime+clouds. For marine celestial navigation, there are fifty-eight stars that are regularly used / have been standardized on: * https://en.wikipedia.org/wiki/List_of_stars_for_navigation https://en.wikipedia.org/wiki/List_of_stars_for_navigation With electronics it may be possible to see more than with the naked eye ("Mark One Eyeball"), and have a larger 'almanac' with digital storage than is practical with paper. As a side note: using only one star and the Sun would give you two lines of position, and they would potentially intersect at two locations, so if you don't have any estimate of your position you don't necessarily know where you are between the two: * https://en.jeandusud.com/two-equations-for-celestial-navigation/ https://en.jeandusud.com/two-equations-for-celestial-navigat... If you do have some idea, then you'd pick the intersection which is closest.