 The dates in the Alexandrian and Julian calendars are in one-to-one correspondence except for the period from 29 August in the year preceding a Julian leap year to the following 24 February.From a comparison of the astronomical data with the Egyptian and Roman dates, Alexander Jones concluded that the Egyptian astronomers (as opposed to travellers from Rome) used the correct Julian calendar.An inscription has been discovered which orders a new calendar to be used in the Province of Asia to replace the previous Greek lunar calendar.