The entire idea of week days is arbitrary. Days are rotations of Earth around its axis, years are orbits of Earth around the Sun and months almost match lunar

The entire idea of week days is arbitrary. Days are rotations of Earth around its axis, years are orbits of Earth around the Sun and months almost match lunar cycle. Weeks of seven days are just something somebody came up with a long time ago. Ancient Egyptians, ancient Chinese and pre-Napoleon French revolutionaries used ten day weeks.