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The Core Mystery Brief
A 5,200-year-old passage tomb in Ireland, precisely aligned so sunlight illuminates its inner chamber on the winter solstice.
What We Know
Older than Stonehenge and the Egyptian pyramids, the mound's roof box admits a beam of sunlight for 17 minutes at dawn on the solstice.
What Is Debated
The full extent of Neolithic astronomical knowledge encoded in the site is debated.
The Mystery
How did Neolithic builders achieve such precise solar alignment?
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