The Bible does not give a date for the birth of Jesus. The holiday is exactly nine months following [[Annunciation]] on March 25. On the Roman calendar, March 25 was marked as the [[spring equinox]] while December 25 was considered the date of the [[winter solstice]]. Both of these dates are traditional and merely approximate.<ref>Sosigenes of Alexandria intended March 25 to be the date of the equinox when he designed the Julian calendar. The calendar was introduced by Julius Caesar in 45 BC. By modern calculations, the equinox is on March 21 or 22. A calendar reform by Augustus is responsible for much of the misalignment. It is possible there was also an error present from the beginning.</ref> According to an ancient Jewish tradition, Creation occurred on the equinox. Influenced by this tradition, Christians in the Middle Ages celebrated New Year's Day on March 25. | The Bible does not give a date for the birth of Jesus. The holiday is exactly nine months following [[Annunciation]] on March 25. On the Roman calendar, March 25 was marked as the [[spring equinox]] while December 25 was considered the date of the [[winter solstice]]. Both of these dates are traditional and merely approximate.<ref>Sosigenes of Alexandria intended March 25 to be the date of the equinox when he designed the Julian calendar. The calendar was introduced by Julius Caesar in 45 BC. By modern calculations, the equinox is on March 21 or 22. A calendar reform by Augustus is responsible for much of the misalignment. It is possible there was also an error present from the beginning.</ref> According to an ancient Jewish tradition, Creation occurred on the equinox. Influenced by this tradition, Christians in the Middle Ages celebrated New Year's Day on March 25. |