“ The moon-god is par excellence the god of nomadic peoples, their guide and protector at night when, during a great part of the year, they undertake their wanderings, just as the sun-god is the chief god of an agricultural people. The cult once introduced would tend to persevere, and the development of astrological science culminating in a calendar and in a system of interpretation of the movements and occurrences in the starry heavens would be an important factor in maintaining the position of Sin in the pantheon. ”