Orion was a son of Poseidon, and famous as a hunter. He fell in love with, and courted, Merope, but grew impatient at her father's conditions, and raped her. Her father blinded him as punishment. Orion, upon the advice of an oracle, traveled east to the point where Helios arose from the ocean. Dawn fell in love with Orion and slept with him, whereupon Helios (the sun) cured his sight. Orion decided to seek out Merope's father to get revenge, but Artemis persuaded him to become her hunting companion instead. Apollo, fearing for the chastity of his sister Artemis, sent a giant scorpion to chase Orion. Unable to slay the scorpion, Orion set out across the water to escape it. Apollo convinced Artemis to shoot the bobbing object out on the waves. Her arrow pierced Orion's head and killed him. In grief she placed him in the heavens as the constellation Orion. Apollo then placed the scorpion in the sky as a constellation, where it still chases Orion.

Another version of the myth says that Diana ordered Vulcan to guide Orion to see the rising sun, because she favoured him (Orion), so that his sight could be replaced. Vulcan stood on Orion's shoulders and guided him there. Oh, and in case you wanted to know, Diana is the equivalent Roman name for the Greek goddess Artemis, and Vulcan is the equivalent Roman name for the Greek god Hephaistos.