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The Thirteen Towers of Chankillo are built north to south along a ridge of a low hill, regularly spaced. To the east and west investigators found two observation points, to observe the rising and setting positions of the Sun over the year. This suggests that some activities of the ancient civilization were regulated by a solar calendar. The towers had been known to travelers for centuries, but the astronomical function of the towers was discovered in 2007 by Iván Ghezzi and Clive Ruggle.
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