I know that there is discussion between the Vatican and the Orthodox religions to come up with celebrating Easter
on the same date. An Orthodox person I message with on FB agrees with me that whatever day they come up
with, it should be synced with the Jewish Passover.
The traditional paschalion synchronizes Easter with Passover
according to the Christian calculation of Passover. In 2025, the Gregorian lunar month of Nisan began on March 31 (that is, at sunset on March 30). Its 14th day (Passover) was Sunday, April 13. Easter was the following Sunday, April 20.
However if by saying "it should be synced with the Jewish Passover" he means that it should be synchronized with the first day of Unleavened Bread according to the present-day Rabbinic Jewish calendar, I respond that there are reasons not to do this. The first-century Jewish writer Josephus wrote that in Herodian times, the Passover sacrifices were offered at the
first full moon on or after the Spring equinox (Antiquities 3.248/3.10.5). The modern-day Rabbinic Jewish calendar, due to a slight solar drift in its calculation, in 3 years out of every 19 places the Feast of Unleavened Bread at the
second full moon after the equinox. This happens in the 3rd, 11th and 14th years of the Gregorian 19-year cycle. The last time this happened was in the year 2024, the 11th year of the cycle. The next time it will happen is the year 2027. the 14th year of the cycle. The Gregorian paschalion tries, and for the most part succeeds, to celebrate Easter at the time of the
first full moon on or after the equinox, according to the rule described by Josephus. I see no reason to follow the present-day Rabbinic Jewish calendar in its error of celebrating sometimes at the
second full moon after the equinox.