 It is often (tacitly) assumed that the start of the Whm Mswt coincided with the accession date of Ramses XI, but this is nothing more than a hypothesis.Whereas it now seems beyond doubt that the accession date of Ramses XI (= the date on which his regnal year changed) fell on "month 11, day 20", it does not automatically follow that the year change for the Renaissance coincided with this date as well.It is safer to recognize that we simply don't know the precise date on which the Whm Mswt was inaugurated.