Why are there twelve months in a year and seven days in a week?
Astrology & Astronomy, plus some politics thrown in for good measure About 5000 years ago, or so, people looked up and started seeing constellations and telling other people about them. It is handy to have them as a reference for navigation and determining the seasons. Originally there were 13 constellations that the sun passes through in a year. One of those constellations only takes up a few days of the sun’s time, so it was removed (politics). The calendar has changed quite a bit and our current calendar is only about 400 years old. The ‘seven days’ comes from the phases of the moon. A moon goes through all of the phases (from new moon, to full moon, and back to new moon) in 28 days. We can visually ‘see’ this in 4 stages. 28 / 4 = 7 days.
