Why are there 7 days in a week?

The Moon and Sun are famous for being major players in the formation of ancient and modern calendars. Let's learn why months are months and weeks are weeks.

Here's that great resource about the Roman Calendar I mentioned, to learn why the Romans had a string of centuries that became known as the "Years of Confusion":

http://penelope.uchicago.edu/~grout/encyclopaedia_romana/calendar/romancalendar.html

A list of all the Blue Moons happening in the next several years:

https://www.moongiant.com/Blue_Moon_Calendar.php

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Видео Why are there 7 days in a week? канала Sidewalk Science Center