The date of Easter is a variable one, calculated based on a lunisolar calendar. Determining its occurrence requires understanding the relationship between the spring equinox and the phases of the moon. The Western Christian Church uses the Gregorian calendar for this calculation, leading to Easter falling on a different date each year.
Knowing the specific date holds significance for liturgical planning within various Christian denominations. It also affects scheduling for secular events, school holidays, and business operations in many countries. Furthermore, historical researchers often need precise dates to accurately place events within a chronological framework.