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Ruin Complex in Peru Believed to be the Oldest American Solar Observatory（图）
Solar Observatory archaeoastronomy
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2007/3/13
1 March 2007，The Thirteen Towers of Chankillo, a series of 2,300-year-old towers spread over 300 meters on a hilltop in Peru's Casma-Sechin River Basin, form the oldest solar observatory in the Americ...