http://news.bbc.co.uk/2/hi/science/nature/7483566.stmJulius Caesar's invasion of Britain in 55BC could not have occurred on the dates stated in most history books, a team of astronomers have claimed.
The traditional view is that Caesar landed in Britain on 26-27 August, but researchers from Texas State University say this cannot be right.
Dr Donald Olson, an expert on tides, says that the English Channel was flowing the wrong way on this date.
They instead favour an invasion of the south coast at Deal on August 22-23.
The claims appear in the latest issue of Sky & Telescope magazine.
Caesar came to Britain with 100 warships and two legions comprising 10,000 men. But as he approached Dover's white cliffs, spear-wielding Celtic warriors lined up along the ridge, prompting the Roman leader to look for a better landing spot.
He ordered his fleet to move along the coast, and after travelling about seven miles they came to "an open and flat shore".
What has been a matter of some debate is whether Caesar sailed left or right and when exactly his armada landed.
Caesar mentioned strong tides, a full Moon and an ocean current. The astronomers Edmund Halley and George Airy previously used this information to try to solve the problem. But they disagreed with each other's conclusions.
/Marcus
Om inte den här ändringn av datumet har någon relevans för erövringen så kan man ju tycka att de här astronomerna skulle räknat ut något användbart. Som exempelvis kunde man navigera efter si och sånt väder när man utvandrade från/till polynesien för tusentals år sedan.