DOB?

In Rome a monk living about 530 ad

                   A mathematician and an astronomer

Was given the task of calculating

                   And reforming the Christian calendar

In essence to pinpoint with all precision

                   The date of Jesus Christ’s birth exactly

A miscalculation was discovered later

                   He was four years out unfortunately

Christ was born on January the sixth 

                   According to the scholarly Egyptians

The date of Christ’s death was thought

                   More important to the early Christians

Rome selected Christ’s birth date to be

                   On the twenty fifth day of December

To coincide with the old pagan festivals

                   Like that of Mithras and Saturnalia

The sixth of January is Christmas day

                   For the apostolic church from Armenia

But its the following day that’s Special

                   For the Orthodox Church of Russia