Astronomical charts and calculations on 9th Century Mayan wall paintings | Ghostsigns

http://www.ghostsigns.co.uk/2012/06/astronomical-charts-and-calculations-on-9th-century-mayan-wall-paintings.html

Antiquity Journal

http://php.york.ac.uk/org/antiquity/projgall.php

I thought the Rude Man and White horse were unusual - Now, a donkey?

http://www.antiquity.ac.uk/projgall/grigoriev331/