LOS ANGELES, CALIFORNIA—A research team led by Charles Stanish of UCLA’s Cotsen Institute of Archaeology used astronomical software and 3-D modeling to determine that during the winter solstice, southern Peru’s Cerro del Gentil pyramid aligned with two geoglyphs and the setting sun. The geoglyphs are two stone lines that are positioned so that they appear to frame the pyramid as the setting sun sank behind it. “Thus the pyramid and the linear geoglyph constitute part of a single architectural complex, with potential cosmological significance, that ritualized the entire pampa landscape,” they wrote. The team continues to study other geoglyphs in the area. “A lot of them are being destroyed by construction,” Stanish said.