| Maya Exploration Center Non-profit specialty tour operator offering educational adventures in Mesoamerica. Details of regular and custom organised Chiapas tours. | Cancun and the Riviera Maya Information about Cancun, Cozumel, Isla Mujeres, Playa del Carmen and entire Riviera Maya area. Includes photos, hotels, chat and message boards. | Calendar Studies Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion. |
