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The 25 December Nativity of Christ was attested very early by Hippolytus of Rome ( 170 – 236 ) in his Commentary on Daniel 4: 23: “ The first coming of our Lord, that in the flesh, in which he was born at Bethlehem, took place eight days before the calends of January, a Wednesday, in the forty-second year of the reign of Augustus, 5500 years from Adam .” Another early source is Theophilus Bishop of Caesarea ( 115-181 ):" We ought to celebrate the birth-day of our Lord on what day soever the 25th of December shall happen.
" John Chrysostom, in a sermon preached in Antioch in 387, relates how the correct date of the Nativity was brought to the East ten years earlier.
It was the first day of the year in the medieval Julian calendar and the nominal vernal equinox ( it had been the actual equinox at the time when the Julian calendar was originally designed ).
Considering that Christ was conceived on that date, 25 March was recognized as the Feast of the Annunciation which had to be followed, nine months later, by the celebration of the birth of Christ, Christmas, on 25 December.
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