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The Mayans, 2000 B.C. - 1500 A.D.
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| The Mayan calendar was very accurate and complex. The earliest known solar calendars were carved in stone and used in 400 B.C. among the Maya. They used 20-day months and had two calendar years: the 365-day Vague Year, or haab, and the 260-day Sacred Rounda, or tzolkin, which coincided every 52 years, which together formed the day-count calendar. |
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