The Scaligerian version is largely based on these dates.
We are talking here about the two major milestones of the traditional chronology – the Nativity of Christ and the First Ecumenical Council of Nicaea, often called the Council of Nicaea.
The two new canons are: 3) To celebrate Easter only after the first Vernal Full Moon. following the Jewish Passover, which in the Christian patristic literature was sometimes called the 'Law Passover'- i.e.
Passover according to the Law of Moses, and sometimes – the '14th Lunar month of Nisan'. The Council which established Paschal (it is thought to be the Council of Nicaea) could not have taken place earlier than 784, as only beginning with this year, due to the slow astronomical shift of the moon phases, the concurrencies of the calendar (determined by Paschal) Christian Easter and the 'lunar'('Cynthian') Jewish Passover-Full Moon had ceased.
This rule – 'Computus' is quite complicated and is connected to astronomical concepts.