Man, being well organized, has developed a system to show what he is doing versus what nature is doing. Among the most important of these is temporary sorting, which also dates back to modern times.
Why is 1 week 7 days? Let's try to figure out when it was adopted and by whom it was officially issued.
To understand the concept of "week", you first need to understand the day and the month, because the week came after these 2 time periods.
The sun is in relation to the earth.
Since ancient times, humanity has invented the concept of the day in accordance with the movements of the sun.
Left: Sunrise; right: Sunset.
Accordingly, the period of time from sunrise to sunset is called "day".
The 1 month time period is associated with the Moon, which is our satellite. Accordingly, the period of time that elapsed from the Moon's orbit to return to the same location is also called a "month."
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It took more than a day but less than a month to better organize life over time.
To do this, instead of the Sun, which always looks the same, the Moon is used, which has different shapes.
Moon change.
By studying the various motions of the moon, man has created a weekly system in accordance with these motions.
Since ancient times, man has been watching the moon.
This system looks like this: The entire cycle of the moon phase is divided into quarters. Each phase includes just 7 days.
Moon phases.
1 month is the time until the moon returns to its original position.
Since this time occurs in 4 phases, each phase is 7 days, for a total of 28-29 days.
The first to calculate this weekly time system are the scientists of Babylon.
Then, this 7-day system was adopted in Ancient Greece and Rome.
1 week (7 days) was officially adopted in the Roman Empire by Constantine (272 AD-337 AD)
Roman Emperor Constantine the Great.
In addition to this general theory, there is also a more mystical opinion: ancient people saw 5 more planets outside the Sun and Moon, which is equivalent to 7 in total.
It is surprising that the number 7 is influential in many things: 7 continents, 7 wonders of the world, 7 colors of the rainbow, 7 steps of the sky. There are many more interesting things to be found related to this strong figure.