|Diagram of missing and "recalibrated" years.|
His conclusion: there is a gap of years, from 614 to 911, for which any dates and events ascribed did not in fact take place. Essentially, a 300-year span has been "presumed" by historians who have tried to make sense of the unclear and inaccurate data we have; methods of radiometric and dendrochronological dating are unreliable, et cetera. Others have picked up on this and added to it; of course, he also has his opponents.
Illig has to assume enormous errors on the part of archaeologists and historians, as well as an elaborate conspiracy taking place in the centuries after 911 to "record" history that took place in the three centuries previous. Some of his arguments result from his misunderstanding of Gregorian calendar reform and dating methods. Some are just assumptions that contemporary witnesses are untrustworthy.
Is there a chance he's right? Is it possible that we are living in the year 1715 CE? Fortunately, astronomy helps. The Persian Wars between Greece and Persia lasted from 499-449 BCE.* The Greek historians of the wars tell of two solar eclipses taking place not far apart. The only times for two solar eclipses near each other in that part of the world were 2492 years ago and 2490 years ago, on 2 October 480 BCE and 14 February 478 BCE.
So there it is. No missing time. Thanks, science!
*One of these battles, Marathon, is remembered in the present day in footraces across the world. Another battle, Thermopylae, gave us the plot for the movie "300."