Astronomy and calendars right|thumb|upright|Mosaic of Creation of Adam from Monreale Cathedral - dated year 1 A.M. (September 5509 BC) in the Byzantine calendar. The epoch of the Byzantine calendar, used in the Byzantine Empire and many Christian Orthodox countries, is equivalent to 1 September 5509 BC on the Julian proleptic calendar (see image).Stephenson, Paul. "Translations from Byzantine Sources: The Imperial Centuries, c.700–1204: John Skylitzes, "Synopsis Historion": The Year 6508, in the 13th Indiction: the Byzantine dating system". November 2006.
astronomy and calendars right|thumb|upright|mosaic of creation of adam from monreale cathedral - dated year 1 am (september 5509 bc) in the byzantine calendar the epoch of the byzantine calendar used in the byzantine empire and many christian orthodox countries is equivalent to 1 september 5509 bc on the julian proleptic calendar (see image)stephenson paul "translations from byzantine sources the imperial centuries c700–1204 john skylitzes "synopsis historion" the year 6508 in the 13th indiction the byzantine dating system" november 2006