Nota (STScI); Mayan calendar: © Lynx / ​ Iconotec com / ​ age fotostock; Mayan astronomer: © Albert J.
Nota ‏; age fotostock ​ /‏ Iconotec com ​ /‏ Mayan calendar: © Lynx ‏; age fotostock ​ /‏ Mayan astronomer: © Albert J.