Unfortunately, the Gregorian calendar has not restored the time of Julius Caesar, but the time of the First Council of Nicaea (325 AD), when the rule about how

Unfortunately, the Gregorian calendar has not restored the time of Julius Caesar, but the time of the First Council of Nicaea (325 AD), when the rule about how to compute the date of the Easter was established. For the time of Julius Caesar, about 3 more days would have been needed, which would have made the Christmas coincident with the Winter Solstice, and which would have made much more sense.