The correct options are
A How to calculate the length of day and night
B The concept of the Sun rising and setting
C Zodiac signs
Mesopotamia had excellent astronomers. They had figured out how to calculate the length of days and nights. They were also aware of the rising and the setting of the Sun. The Zodiac signs were a product of the work of Mesopotamian astrologers, with the Mesopotamians dividing the sky into twelve separate zones. Each of the above was possible because they had Ziggurats as observatories to study the sky, stars, and planets.