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One temple in particular has been studied for its apparent alignment to the movements of the sun. It has been called humankind's earliest calendar in stone. The rising sun enters the portal and clearly illuminates specific places, seeming to mark the passage of the Equinoxes (when day and night are equal) and at Winter and Summer Solstices (when either the night or the day is longest.) Openings in the roofs and other special stones might have been arranged for tracking the movements of the moon and stars; there are indicators that some system was in place for this. Farming people had a food supply that depended on the changing of the seasons and regular weather patterns. Knowing where one was in the passage of time was important for calculating how long a harvest would need to last, and how soon more could be expected.
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