Word: alautun
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...people with a big sense of history, the Mayans even calculated time divisions to include a 400-year unit 1582 and ultimately an alautun (64 million years). It was, presumably, in carefully built astronomical observatories such as that in Chichen Itza on the Yucatan peninsula (opposite) that the Mayans perfected their calendar. Three square openings in the masonry walls fixed sight lines on the heavens for specific reference points, where the sun and moon could best be observed at their most informative stages...
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