Orion was a hunter in Ancient mythology. There are various stories about his birth as well as the way he died.
According to the oldest version, he was the son of the god Poseidon and Euryale, daughter of King Minos of Crete. Thanks to his father, Orion had the ability to walk on water, which is how he reached the island of Chios. There, after drinking too much, he made sexual advances to Merope, the daughter of the local king. King Oenopion had him blinded and removed from the island. Blind Orion reached the island of Lemnos, which was the place where god Hephaestus had his forge. Helped by Hephaestus and his servant Cedalion, Orion reached the East where the sun god Helios restored his eyesight. He then went to Crete and hunted with the huntress goddess Artemis and her mother Leto; he was so enthusiastic that he declared he would kill every animal in the world. Gaea, the goddess of the Earth, got angry and sent a giant scorpion which successfully killed Orion. Upon hearing the news, Artemis and Leto asked from Zeus to put their fellow hunter on the skies; Zeus agreed and turned Orion into a constellation, as well as the Scorpion that killed him.
A different version of Orion’s death has it that he fell in love with Artemis; the goddess was also very much in fond of him. However, her twin brother Apollo was quite against this love affair, though, and devised a plan. One day, while Orion was swimming in a lake with his head barely visible, Apollo went to his sister and challenged her skills as an archer. To prove him wrong, he told her to shoot at Orion’s head, whom Artemis barely recognised, as there was a considerable distance between them. Artemis hit the target, unknowingly killing her lover.
The Ancient Egyptians were the first to write about Orion, and place him into their mythologies. They associate the stars of Orion with Osiris, the sun-god of rebirth and afterlife, and one of the most important gods of the ancient Egyptians. (Orion was considered the abode of Osiris following his resurrection. Isis dwelt on Sirius. In Egyptian mythology, Osiris was murdered and dismembered by his jealous brother, Seth, then briefly brought back to life by his sister and consort Isis to father the god Horus. Egyptians saw Osiris in the Moon, whose phases caused the all-important Nile to rise and fall each month, and in the constellation Orion, whose appearance was connected with the annual flood. As god of the dead, Osiris welcomed the recently deceased to their new world.
Sirius, the brightest star in the sky, rises on the eastern horizon just before the Sun once each year. This following a period of complete invisibility lasting about 70 days (during which time it lies in the daytime sky). Egyptian inscriptions describe the last appearance of Sirius in the night sky as its death; its daytime invisibility as purification in the embalming house of the nether world; and its rising with the Sun as a resurrection. Accordingly they calibrated the process of mummification to this celestial cycle, completing it in exactly 70 days.
The theory has been contentious since its outset. Ed Krupp (Griffith Observatory in Los Angeles) and Anthony Fairall (astronomy professor at the University of Cape Town) have both criticised the astronomical observations which underpin the theory and even suggested that in order to make the facts fit the map of the pyramids had to be inverted. However, Archie Roy (Professor Emeritus of Astronomy at Glasgow University) and Percy Seymour (astronomer and astrophysicist at Plymouth University) have defended the theory and noted that the visual correlation is striking when the pyramids of Giza are viewed from the north. Furthermore, there is some support for it in the fact that the Pyramid Texts (which date to the fifth dynasty but were most likely formed from earlier religious concepts) make frequent references to the connection between the the resurrection of the king and Sahu (The earliest Egyptian representation of Orion).
The same layout has been claimed for Teotihuacán, in Mexico
The ‘Pyramid of the Sun’ at Teotihuacán has the same base dimensions as the Great pyramid of Giza, but is is exactly half the height. It appears as if both cultures incorporated Pi into their dimensions.