Solar-Aligned Pictographs at the Paleoindian Site of Painel do Pilão along the Lower Amazon River at Monte Alegre, Brazil
Fig 13
Red shelter circle above the excavation unit, but underneath the painted outcrop.
The circle faces 270° but the shelter prevents view of the western sky. However, beneath the red circle is a crevice that allows view of the eastern sky. The red circle marks a spot where the sun would shine through the crevice directly beneath the circle on the day of the equinox.