this greek story is possibly 100,000 years old https://www.iflscience.com/the-worlds-oldest-story-astronome...
> The seventh sister is observable even in modern times. Among the Greeks, Arabs and Romans, the ability to see the seventh star was used as an eye test to determine ones suitability for certain tasks as a warrior. Stories of the seventh daughter being taken captive no doubt stem from how elusive seeing that seventh star was though some could see ten or more if viewing conditions are good enough. The conjecture about this being a hundred thousand year old story is probably hogwash in order to publish something.
How would this work? This is a test that operates on the honor system where it's guaranteed that everyone knows the right answer.
It must either be the case that no problems will arise if people are free to lie about their vision -- in other words, that acuity of vision has nothing to do with performance at the special tasks gated by this test -- or that the appearance of the stars changes day-to-day, so that someone who is known to be able to see all seven is capable of telling the difference between a testee who can also see all seven and a testee who is lying about their ability to do so.