Jesus Christ is born on December 25 and yet the era begins on January 1, ANNO DOMINI. Why 6 days later than the actual birth?

Answer

We do not know the date of birth of Jesus. Even the year is not exactly known. At that time there were no systematic civil registers. So it could be any day. Around the time of the breakthrough of Christianity as the Roman state religion (Council of Nicaea, 325), a synchronicity happened between the then celebrated lengthening of the days after the shortest day (Sol Invictus) and also with the god Mithras who died on December 25. was born. It is likely that for practical or political reasons people then “re-used” these dates, with an association like “Jesus = the light enters the world = the days are getting longer”.