The calendar, rooted on observations of the movements of the sun, moon and planets, was based on a ritual cycle of 260 named days. The 260-day calendar, called the tzolk’in, was one of several ...

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The oldest-known version of the ancient Maya calendar has been discovered adorning a lavishly painted wall in the ruins of a city deep in the Guatemalan rainforest. The hieroglyphs, painted in black ...

Two pieces of an ancient wall may preserve the earliest evidence of the Maya calendar. The fragments are decorated with a dot and line above a deer head – representing one of the dates from the ...