Painel do Pilão (Panel of the Pillar) by Christopher Davis

Painel do Pilão is an open-air rock-art site in Serra da Paituna (Sierra of the Black-water Lake) in the hinterland of Monte Alegre (Happy Mountain) along the Amazon River in Brazil. The date of the rock-art is unknown but pre-dates Europeans in Brazil (1530's). Evidence suggests that rock-art had been created in the Serra (Sierra) as far back as 12,000 years ago.
This site is perhaps the most intriguing in all the region because of the numerous abstract images and the "chart" that suggests some form of calendar. In the distance the craggy mountain peak offers a "hitching post" that the sun passes through as it moves across the sky during the day.
The sunshines through at some time between 1 and 3 PM but the position for seeing the sun at the center of the "hithing post" changes throughout the year as the sun is more southern during the late part of the year (October through February) and more northern at the early part of the year (March through September). I believe the sun can be seen in the "hitching post" at the spot where the flashlight is located in the picture during the late part of the year.