New Date for Caesar's British Invasion

June 25, 2008

In 55 BC, when Julius Caesar and his fleet approached the white cliffs of Dover on the British coast, he faced unexpectedly strong tides. Researchers from Texas State University have used tidal measurements and other astronomical clues to revise the exact date of the historic landing.

Read more here:

http://www.skyandtelescope.com/news/21410774.html

To quote:

Caesar, in his first-hand account of the invasion, carefully noted the phase of the Moon, the approach of the equinox, and above all the unexpected ocean tides his fleet encountered. So it's a simple matter for any astronomer to determine the precise date of the invasion, right?

Wrong! No lesser astronomers than Edmond Halley and George B. Airy carefully studied the astronomical aspects of 55 BC in hopes of letting historians know the exact date and location where Caesar and his legions came ashore. But Airy and Halley disagreed with each other. And what's more, they both got it partly wrong, as Olson's Texas State team found out on their research trip.