The Missing Passover

[Dawid]

The Essenes were celebrating it on the 14th and 15th like everyone else, but they calculated the beginning of Nisan differently. They used the equinox to determine the beginning of the year, rather than agricultural indicators.

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Josephus would have mentioned this about the Essenes, whom he was very particular about. There is nothing in the Talmud about this either as the Essenes were concerned.

They don't, but the Dead Sea Scrolls do tell us about it. Philo also refers to this system.