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Archaeologist Mariana Petry Cabral of the Amapa State Scientific and Technical Research Institute and colleagues working in the Amazon have discovered what could be a centuries-old astronomical observatory dubbed the Brazilian Stongehenge.
The 127 blocks, some as high as 9 feet tall, are spaced at regular intervals around the hill, like a crown 100 feet in diameter.
On the shortest day of the year — Dec. 21 — the shadow of one of the blocks, which is set at an angle, disappears.
"It is this block’s alignment with the winter solstice that leads us to believe the site was once an astronomical observatory,” said Mariana Petry Cabral…
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