Why do some months have 30 days, others 31, and then one only has 28? It doesn't make sense! Or so thought the man who reinvented the annual calendar in 13 months.
Who Caught On?
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
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