
Archaeologists believe they have identified a new way of putting
accurate dates to great events of prehistory. Rare and spectacular storms on the sun appear to have left their
mark in forests and fields around the planet over the past 5,000
years.
Michael Dee, of Oxford University’s research laboratory for
archaeology and the history of art, thinks evidence of such solar
storms could help put precise years to some of the great
uncertainties of history: the construction of Egypt’s Great
Pyramid of Giza, the collapse of the ancient Mayan civilization
in Central America, and perhaps even the arrival of the Vikings
in the Americas.
Every tree maintains its own almanac in the form of annual growth
rings. For decades dendrochronologists have been using tree-ring
evidence and radiocarbon dating to build a timetable of events
that confirm historical accounts, even those predating the first
written chronicles.










