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Christians around the world will soon be celebrating Christmas Day, the day set aside to celebrate the birth of Jesus Christ. But did you know that the Bible does not give a specific date for the birth of Jesus? The earliest Christians did not celebrate his birthday at all. For the first several centuries of Christianity, the focus was on Jesus’ teachings, death and resurrection rather than on his birth. It was not until the fourth century that December 25 became established as the official date to commemorate Jesus’ nativity.
The earliest known reference to December 25 as the birth of Jesus appears in Roman records around A.D. 336, during the reign of Emperor Constantine, the first Roman emperor to convert to Christianity. By this time, Christianity was becoming more widely accepted within the Roman Empire, and church leaders sought to establish a unified calendar of Christian celebrations.
There are two main historical explanations for why December 25 was chosen. One theory is that early Christians intentionally selected a date that coincided with popular Roman winter festivals, particularly Saturnalia and Dies Natalis Solis Invicti (the “Birthday of the Unconquered Sun”), which celebrated the winter solstice and the return of longer days. By placing Christmas near these well-known festivals, church leaders may have made Christianity more familiar and appealing to converts.
Another explanation is rooted in early Christian theology rather than pagan influence. Some early Christians believed that Jesus was conceived on the same calendar date as his crucifixion, which they calculated as March 25. Counting forward nine months from March 25 leads to December 25 as the date of his birth. This symbolic reasoning was common in early Christian thought and does not rely on external festivals.
Despite the December 25 tradition, most historians agree that Jesus was probably not born on that date. Clues in the Gospel accounts suggest a different time of year. The Gospel of Luke describes shepherds watching their flocks at night, an activity more typical of spring or early fall in Judea than winter. Additionally, a Roman census mentioned in the Gospels would have been difficult to conduct during the coldest months.
Based on historical and astronomical evidence, many scholars place Jesus’ birth sometime between 6 B.C. and 4 B.C., during the reign of King Herod the Great, who died in 4 B.C. Some historians suggest a springtime birth, possibly around March or April, while others propose early autumn.
In short, December 25 was chosen centuries after Jesus’ life as a symbolic and practical date rather than a historically precise one. While historians continue to debate the exact timing of Jesus’ birth, the significance of Christmas lies not in the accuracy of the date, but in what the celebration represents for Christians around the world.