The Roman method for calculating the date to Easter is to set Easter Sunday as the first Sunday after the first full moon after the autumnal equinox. Although this is now the accepted method of calculating Easter, the Celtic church had a different method. This however ran into problems as Easter would occasionally fall during Lent, which was a period of fasting. In England, the Synod of Whitby in 663 resolved the dating issue in the favour of the Romans, which had an influence on the control of Christianity in England.
Such events in Australia include: