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Easter, a cornerstone of Christian faith, commemorates the resurrection of Jesus Christ. Celebrated annually, it anchors the Holy Week, a period of profound reflection beginning on Palm Sunday and culminating on Holy Saturday, the day preceding Easter Sunday. While the structure of Holy Week remains consistent, the specific date of Easter fluctuates each year, consistently falling on a Sunday. The established method for determining Easter's date dictates that it occurs on the first Sunday following the full moon that appears on or after the spring equinox. This astronomical and calendrical calculation places Easter on a Sunday between March 22 and April 25. The enduring question of why Easter is invariably observed on a Sunday has a multi-layered answer that combines religious significance, historical development, and the gradual standardization of Christian practices. The most apparent reason lies within the scriptural accounts of the Gospels, which explicitly state that Jesus's resurrection occurred on the first day of the week, which corresponds to Sunday. However, the acceptance and formalization of Sunday as the designated day for Easter were not immediate or straightforward. Matthew Easter, an associate professor of biblical studies at Missouri Baptist University, sheds light on the intricate process by which the Christian community reached a consensus on Easter's Sunday observance. He emphasizes the relationship between Easter and the Jewish Passover, noting that Passover can occur on any day of the week. In the early Christian communities of Asia Minor, now modern-day Turkey, Easter was initially observed on the same day as Passover, regardless of whether it fell on a Sunday. This practice ignited debate among early Christians, raising questions about whether Easter should exclusively be observed on a Sunday. The biblical account places Passover on the 14th day of the month of Nissan in the Jewish calendar, a period that typically falls within March and April. During the Roman Empire, the practice of celebrating Easter on a Sunday gradually gained prominence and formality. Around 190 AD, Bishop Victor of Rome took a decisive step, decreeing that all Christians must celebrate Easter on a Sunday. To enforce this decree, he threatened to excommunicate Christians who continued to observe Easter on Passover, as was the custom in Asia Minor. This bold action sparked considerable controversy and resistance within the Christian community. Ultimately, Bishop Victor relented and withdrew his threat of excommunication, recognizing the diversity of traditions and practices among early Christians. The pivotal moment in solidifying Easter's Sunday observance arrived in 325 AD with the Council of Nicaea, convened by Roman Emperor Constantine. This ecumenical council, a gathering of Christian leaders from across the Roman Empire, aimed to resolve doctrinal disputes and standardize Christian practices. One of the key decisions made at the Council of Nicaea was to establish a uniform method for determining the date of Easter. The Council decreed that Easter should be observed on the first Sunday following the first full moon after the spring equinox. This method, based on astronomical calculations, ensured that Easter would always fall on a Sunday in March or April. The decision of the Council of Nicaea was a watershed moment, establishing a standard practice that has been followed by most Christian denominations for centuries. The adopted method gradually gained acceptance, becoming the prevailing practice for determining the date of Easter. As a result, Easter has consistently been celebrated on a Sunday in March or April, reinforcing the connection between the resurrection of Jesus Christ and the first day of the week.