Maya calendar the land of Yucatán into 13 'kingdoms'. 1897 text by Cyrus Thomas Maya calendar The Maya calendar is a system of calendars used in pre-Columbian Mesoamerica and in many modern communities in the Guatemalan highlands, Veracruz, Oaxaca and Chiapas, Mexico. The essentials of the Maya calendar are based upon a system which had been in common use throughout the region, dating back to at least the 5th century BCE. It shares many aspects with calendars employed by other earlier Mesoamerican civilizations, such as the Zapotec and Olmec and contemporary or later ones such as the Mixtec and Aztec calendars. By
Mesoamerican Long Count calendar The number of leap days, keeping in mind that the year 600 is not a leap year, is 10. Subtracting that from 317 remainder days is 307; in other words, the 307th day of the year 644 AD, which is November 3. To summarize: the Long Count date 9.10.11.17.0 corresponds to November 3, 644 AD, in the "Proleptic Gregorian calendar". To convert a Julian day to a Julian/Gregorian astronomical date (Proleptic Julian calendar before 46 BC): Use an astronomical algorithm such as the "Method of Meeus" to convert the Julian day to a Julian/Gregorian date with astronomical dating of negative