What did the ancient Egyptians use Astronomy to create?

Answer 1

As in most early cultures, the patterns and behaviors of the sky led to the creation of a number of myths to explain the astronomical phenomena. For the Egyptians, the practice of astronomy went beyond legend: huge temples and pyramids were built to have a certain astronomical orientation. Although many of the religious aspects of Egyptian life were known for centuries, it was not until recently that a number of astronomers attempted to find out how important astronomy really was in ancient Egypt.

-J. Norman Lockyer, The Dawn of Astronomy, MIT Press, 1894.-