Inca Calendar according to Guaman Poma s work 1615

The Inca calendar had 12 months of 30 days, with each month having its own festival. (The Incan year began in December, and began with Capac Raymi, the magnificent festival.)



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Celestial Find at Ancient Andes

Archeologists working high in the Peruvian Andes have discovered the oldest celestial observatory in the Americas — a 4,200-year-old structure marking the summer and winter solstices that is as old as the stone pillars of Stonehenge.



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gogeometry.com/world_news_map/inca_ancient_calendar_andes.html