Easter’s date changes each year because it is calculated based on the lunar calendar, which differs from the solar calendar most commonly used today. This calculation is tied to the timing of the spring equinox, around March 21, and involves the first full moon that occurs after this date. Consequently, Easter can be celebrated as early as March 22 and as late as April 25.
This method of determining Easter’s date was established in 325 AD during the Council of Nicaea, where leaders sought to unify the celebration across different regions, which had previously observed Easter on various dates. The connection to the lunar cycle reflects historical ties to the Jewish calendar, as the timing of Passover is also based on the moon’s phases.
The spring equinox symbolizes themes of renewal and rebirth, which align with the essence of Easter. Thus, the calculation of Easter not only serves practical purposes but also resonates with broader concepts of change and transformation that are significant during this time of year.