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The Story of the Annunciation of the Conception of Jesus

And

in the sixth month

the angel Gabriel was sent from God into a city of Galilee, named Nazareth, 27 to a virgin betrothed to a man whose name was Joseph, of the house of David. And the virgin's name was Mary. 28 And the angel came in to her and said, Hail, one receiving grace, the Lord is with you. Blessed are you among women. 29 And when she saw him, she was troubled at his saying, and considered what kind of greeting this might be. 30 And the angel said to her, Do not fear, Mary, for you have found favor with God. 31 And behold! You shall conceive in your womb and bear a son, and you shall call His name JESUS. 32 He shall be great and shall be called the Son of the Highest. And the Lord God shall give Him the throne of His father David. 33 And He shall reign over the house of Jacob forever, and of His kingdom there shall be no end. 34 Then Mary said to the angel, How shall this be, since I do not know a man? 35 And the angel answered and said to her, The Holy Spirit shall come on you, and the power of the Highest shall overshadow you. Therefore also that Holy One which will be born of you shall be called Son of God. 36 And behold, your cousin Elizabeth also conceived a son in her old age. And this is the sixth month with her who was called barren. Luke 1:26-36 MKJV

The Timing of the Annunciation of the Conception of Jesus

In Luke 1:26, the New Testament is crystal clear on the exact month when Angel Gabriel announced to Mary that she was chosen to carry a special Being from from the abode of God. It was on the sixth month of the Jewish Calendar, a month which is not the same in the Julian, later Gregorian Calendar in which this writing is based.

The ATS Bible Dictionary helps us place the Hebrew sixth month in our Julian Calendar.



Abib
The first month of the ecclesiastical year of the Hebrews; afterwards called Nisan. It answered nearly to our April. Abib signifies green ears of grain, or fresh fruits. It was so named, because grain, particularly barley, was in ear at the time. On the tenth of this month the passover-lamb was set apart; it was killed on the fourteenth towards sunset, and eaten the same evening after the fifteenth day had begun. The seven days from the fifteenth to the twenty-first inclusive, were "the feast of unleavened bread," closing with a solemn convocation, Exodus 12:1-13:22. American Tract Society Bible Dictionary.


Based upon the standard nine month [gestation] for birth, we can accurately calculate the month of birth of Jesus, which is the tenth month after the nine months long pregnancy. Jesus could not have been born prematurely. I stand behind that statement not because I was there, but based on the requirement of a perfect lamb for the sacrifice.
If the Julian was the same as the Hebrew Calendar, and Jesus was conceived in the sixth month, He would have been delivered,in keeping with the annunciation month, on the sixteenth (or fourth) month )April) of the pregnancy. The sixteenth month of delivery would have been April not December.
But, the time mentioned in the New Testament is Jewish Calendar. The religious Jewish calendar did not depart from the custom of beginning the year in Spring or the month of Abib or Nisan. As the ATS Bible Dictionary defines it, end of March towards April, matches the beginning of the Jewish Calendar in the Julian Calendar.
Thus, the first month of the annunciation falls on end of March towards the beginning of April in our Julian, Gregorian Calendar. Thus, the sixth month in the New Testament falls on end of September towards October in the Julian Calendar which was in use at the time of conception. After a nine months long pregnancy from end of September towards beginning of October, Jesus was born in end of June towards beginning of July. So, arithmetically, we look for a birth of Jesus in late June or early July, a summer timeline which is very far from December.
What if a month was added to the Jewish religious calendar year when Jesus was conceived? Still, December is very the unlikely month of birth of Jesus because the Julian does not follow such practice of month intercalation.
Therefore, it is impossible that Jesus was born in December. John the Baptist was born sixth month before end of June towards beginning of July. Christmas is more likely to celebrate the birth of John the Baptist.
If you are a believer and you absolutely love Christmas time, would you still keep Christmas as a celebration of the birth of Jesus or would you dismiss the arithmetical or mathematical timing of His birth that proves that Christmas has no biblical basis?
Does knowledge of the word of YHWH God (Jesus) matter?
Knowledge of the will of God did not matter for Eve because she recited verbatim the command of God but ate the forbidden fruit anyway. Moreover, it had been prophesied that today we will yearn after religious fables while we dismiss the sound doctrines of Moses.

You search the Scriptures, for you think in them you have everlasting life. And they are the ones witnessing concerning Me.
John 5:39 LITV