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Key Facts In This Video
The ancient Egyptians used Sirius to predict the annual flooding of the Nile, allowing them to become one of the first civilizations to use a solar calendar rather than a lunar one. 00:34
Julius Caesar started the more precise Julian Calendar in 45 B.C. 02:07
The Mayan calendar consists of 18 months of 20 days each, with five extra days at the end of the year. 05:20