"The moon rising above the central stone cairn of the Majorville Medicine Wheel archaeological site in southern Alberta, Canada...The ""medicine wheel"" consists of a large central stone cairn with 28 spokes radiating outward to an outer ring, all marked with smaller stones.  A portion of the central cairn was excavated in 1971, and artifacts found at the base of the structure dated the start of its construction to some 5,000 years before present, which may pre-date Stonehenge..  .Recent studies have advanced the theory that the medicine wheel is the centre-piece of a large astronomical observatory complex (or sun temple) that covers nearly 100 square kilometers.  Smaller cairns situated on nearby hilltops appear to be aligned with sunrise and sunset during the summer and winter solstices."
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