The core problem is to take things that doesn't have to be multiples as multiple, like Earth's rotation (day) with Earth (year) or Moon (month) time to orbit. A

The core problem is to take things that doesn't have to be multiples as multiple, like Earth's rotation (day) with Earth (year) or Moon (month) time to orbit. Adjusting those simple original ideas to the complexity of reality and the needs of i.e. agriculture ended in what we have now.