In the story I'm writing, the 'henge is a sort of alignment tool for our world and a parallel plane, jest. During the solstices, the henges are perfectly across from each other and sen a dimension hole through the Æthercore, the center of the two planes. This causes a portal to open up for taht day to lith, the land of maelstroms. On the equinoxes, the henges are in exactly the same place, and open up a portal to the opposite plane (jest or earth).
But, in real life, it's just a big eclipse calendar.
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