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by vorg
4214 days ago
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The day and year are settled astronomically. As for the week, it's been in use for at least 2500 years continuously without ever skipping a day and now virtually every country uses it. The month, however, has variable length, has been redefined every thousand years or so, and has competing systems from Islam, Hindu, Jewish, Japanese and other cultures. The month can change, but the week never can. |
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