Who knows , Thom suggests it was . That was what I was getting earlier , when someone says the circle is aligned to Long Meg , whereabouts in/on the circle is critical ,if it is one of the circles stones then it is open season as some are bound to be oriented meaningfully but not necessarily with intent .

If you are looking for an unbroken lineage regarding the use of alignments, astronomy and navigation then as you imlpy, look at seafarers.

Dead right , antikythera device , the whole of the Pacific and much unrecorded stuff .