Intimachay: A December Solstice Observatory at Machu Picchu, Peru

@article{Dearborn1987IntimachayAD,
  title={Intimachay: A December Solstice Observatory at Machu Picchu, Peru},
  author={David Simon Paul Dearborn and Katharina Jeanne Schreiber and Raymond E. White},
  journal={American Antiquity},
  year={1987},
  volume={52},
  pages={346 - 352}
}
We show that a structure built by the Inkas at the entrance to a cave at Machu Picchu was designed to admit the light of the rising sun only for a brief period before and after the December solstice. This structure is precisely constructed, unique at Machu Picchu, and may have played a part in the annual Inka ritual, Capac Raymi. 
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