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How can it be correct that year 621 is year 666 in the Julian calendar? The discrepancy between the Gregorian and the Julian is merely 13 days, nowadays, both pertaining to the calculations of Denis le Petit in A.D. 525. But, I'm aware of that the Julian Calendar has quite a complex history and that Denis is not the only one attempting to find the correct date of Anno Deus. This needs to be substantiated. —Preceding unsigned comment added by Xact (talk • contribs) 18:27, 14 December 2009 (UTC)[reply]