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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. Although the Mesoamerican calendar did not originate with the Maya, their subsequent extensions and refinements of it were the most sophisticated. Along with those of the Aztecs, the Maya calendars are the best-documented and most completely understood.The world will come to an end. In approximately 4 billion years time, when the sun has depleted its supply of hydrogen in its core, our nearest star will swell like a balloon when it starts to burn heavier elements, swallowing the planets of the inner solar system.This is the Mayan Temple of Kukulcan at Chichen Itza. The Temple of Kukulcan is said to be a physical embodiment of the Mayan Calendar. For instance, there are 91 steps on each of the four sides (totaling 364) plus the top platform giving us 365 to match the days of a solar year.