【Acrylic Painting by Dennis Tang】
(Paintings and Photos may not be relevant to the incident described; The Making of @ Youtube: Dennis’ notebook)
Some of our earliest civilizations, the Babylonians, who lived around the area of modern Iraq, observed the cosmos and recorded the movements of planets, the Sun, and the Moon.
The Babylonians found that the time from the half-moon (3rd quarter) to the full moon, from the full moon to the half-moon (1st quarter), from the half-moon to the disappearance of the moon (new moon), and the new moon to the 3rd quarter was about 7 days. So they divide the 28-day cycle of a lunar month into four seven-day weeks.
According to the bible, “the Book of Genesis”, God created the world in seven days. On the first day, God created light. On the second day, God created the sky to separate the water. On the third day, God created land, sea, plants, and trees. On the fourth day, God created the sun, and moon, and separated the day and night. On the fifth day, God created birds and fishes. On the sixth day, God created animals and humans, who were made in the image of God himself. On the seventh day, God finished all his creation and rested.
There were civilizations that chose other numbers, like the Egyptians, whose week was 10 days long; or the Romans, whose week lasted eight days.
In A.D. 321, Emperor Constantine decreed that the seven-day week was the official Roman week and made Sunday a rest day. Although there have been some attempts in history to change the seven-day week system but unsuccessful.
Now, no matter what religion you believe in and wherever you are, the seven days a week system is commonly adopted.
