Planetario Cuzco is a compact astronomy center above the city, close to the Sacsayhuaman side of town. Its programs focus on Inca and Andean sky traditions as much as constellations, so it gives context for the way celestial cycles shaped local architecture, agriculture, and ritual.
The experience usually combines interpretation, a dome presentation, and, when the weather cooperates, telescope viewing. It is best treated as an evening activity rather than a major museum, but it adds a thoughtful layer to Cusco for travelers who have already spent the day among temples and stonework.