I have wondered about this. It is a very old tradition that goes back to a time when people could see seven objects in the sky: Sun, Moon, Venus, Mars, Jupiter, Saturn, and Mercury. It is clear that these became days in the week: Saturday, Sunday and Monday. In French, Tuesday is Mardi (Mars), Wednesday is Mercredi (Mercury), Thursday is jeudi (Jupiter), Friday is Vendredi (Venus), Saturday is Samedi (Saturn), and Sunday is Dimanche (Sabath=Sunday).
:-D The choice of seven days is itself related to the phases of the Moon. Humans have usually used the Sun, Moon and stars for determining the calendar they used. Ancient people were very good at math. Over time, the phases of the moon have been used in religious or spiritual activities and have influenced the female menstrual cycle. The terms "menstruation" and "menses" are derived from the Latin mensis (month), which in turn relates to the Greek mene (moon) and to the roots of the English words month and moon.
It was also a stable geometric number: 7 logs when tied together will remain stable. 3 logs will also remain stable. Both 3 and 7 were, and continue to be, mystical numbers.
:-D Do you feel lucky? What is your lucky number?
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