In Welsh, the word for week is wythnos, which literally means "eight-nights". Historically, the week started and ended with night. – WTF Fun Facts Source: https://en.wikipedia.org/wiki/Eight-day_week

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In Welsh, the word for week is wythnos, which literally means "eight-nights". Historically, the week started and ended with night. – WTF Fun Facts Source: https://en.wikipedia.org/wiki/Eight-day_week