Astro-clues help date Odysseus' return from Trojan War

WASHINGTON — Using clues from star and sun positions mentioned by the ancient Greek poet Homer, scholars think they have determined the date when King Odysseus returned from the Trojan War and slaughtered a group of suitors who had been pressing his wife to marry one of them.

It was April 16, 1178 B.C., that the great warrior killed those who sought to replace him, a pair of researchers say in Monday's online edition of Proceedings of the National Academy of Science.

Experts have long debated whether the books of Homer reflect the actual history of the Trojan War and its aftermath.

Marcelo Magnasco of Rockefeller University in New York and Constantino Baikouzis of the Astronomical Observatory in La Plata, Argentina, said they had to make some assumptions to determine the date Odysseus returned to his kingdom of Ithaca.

But interpreting clues in Homer's "Odyssey" as references to the positions of stars and a total eclipse of the sun allowed them to determine when a particular set of conditions would have occurred.

"Under the assumption that our work turns out to be correct, it adds to the evidence that he knew what he was talking about," Magnasco said. "It still does not prove the historicity of the return of Odysseus," he said. "It only proves that Homer knew about certain astronomical phenomena that happened much before his time."

Homer reports that on the day of the slaughter the sun is blotted from the sky, possibly a reference to an eclipse. In addition, he mentions more than once that it is the time of a new moon, which is necessary for a total eclipse, the researchers say.

Other clues include:

• Six days before the slaughter, Venus is visible and high in the sky.

• Twenty-nine days before, two constellations — the Pleiades and Bootes — are simultaneously visible at sunset.

• And 33 days before, Mercury is high at dawn and near the western end of its trajectory.

This is the researchers' interpretation, anyway. Homer wrote that Hermes, the Greek name for Mercury, traveled far west to deliver a message.

"Of course we believe it's amply justified, otherwise we would not commit it to print. However, we do recognize there's less ammunition to defend this interpretation than the others," Magnasco said.