The specific date commemorating the birth of Mary, the mother of Jesus, is observed on September 8th in the Western Christian tradition. This date is not found in the Bible, but developed later based on apocryphal texts and theological reasoning. Eastern Orthodox churches generally celebrate the Nativity of the Theotokos (the birth of the Mother of God) on the same date, September 8th, although due to differing calendar systems, the date may vary slightly.
Observance of the Nativity of Mary holds significance as it marks the entrance into the world of the individual who would later give birth to Jesus. The date is positioned nine months after the Feast of the Immaculate Conception, which celebrates Mary’s own conception without original sin. This ordering highlights a theological understanding of salvation history.