Not right. The calculations for the Jewish year were standardized well after Christ, I think it was in the 3rd century too. So you see at that time of Christ the Jewish religion did celebrate the correct Passover dates calculated by the astronomical methods the RCC reused in 1553. But as another user pointed out the passover according to the current Jewish year, the calculations for which were completed nearly 1700 years ago, is off by 6 minutes every single year. This was probally unnoticeable back in the day.
Because the discrepancies arose between the now standardized Jewish lunar calendar and the Astronomical events which the calendar was originally calculated on… The Roman Catholic Church in 1553(immediatly following the italian adoption of the Gregorian Calandar) decided it was the right time to recalculate the dates for the Jewish year because the passover was incorrectly falling before the march Equinox(which isn’t supposed to happen), using the astronomical methods which were used to calculate it originally before he Jewish Calendar standardization(although it was only really for a correct Passover calculation and not other purposes), and this revised calculation was to be quite formulaic and using more astronomical data. It has been noted that this calculation will one day itself need to also be revised to coincide with the correct lunar calculations, but that is not until 4100AD.
The biblical commandment to celebrate “easter”, which is more properly known as the christian passover celebration, is both the combination of the same biblical commandment you guys got in Exodus, and also Christ’s words “do this in memory of me” when he sat down having a Passover meal the Thursday before Good Friday, the day he was crucified on April 15th 33AD(the only day during Pilate’s reign that Passover occured on a friday).
The celebration was expanded over the whole week rather than the one day, and it was decided that Easter Sunday, being the day Christ was resurrected, should be the biggest celebration. It was decided that Christ’s words “do this in memory of me” meant that the entire passover week going until the next Sunday(day of resurrection) was to be celebrated in honor and memory of both the saving works of his crucifixion and his Father’s original saving passover when he rescued the Jews from Egypt. But the Crucifixion, the new Passover occurring event which of cause occurred on the same Jewish day but on the next “Julian day”(a “Julian calandar” Friday), is to take credence.