By the means of the Hungarian Calendar when we deduct cc. 200 years from the date of a day and from the date of eclipses which are preceding the year of AD 1100,we can get the historical eclipses recorded in the chronocles.

Of course it is true in vice-versa too.To the dates which were indentified traditionally up to AD 900 historically in the records of the chronicles,we should add cca.200 years in order to get the real astronomical date.

After the year of AD 1150 the synchronization error ceases to exist.