<human>:  When did the ancient Egyptians start to worship the sun god Ra?
<bot>: The ancient Egyptians worshipped the sun god Ra from the earliest days of the civilization. Ra was the god of the sun and the sky, and he was the first god in the Egyptian pantheon. He was also the creator of the world and the king of the gods. Ra was usually depicted as a falcon-headed man with the head of a ram, a sun disk on his head, and a solar barge.