The Chosen Day

“The Saturnalia (which means ‘sun-stop’) is the week-long pagan festival of the winter solstice which began on

December the 17th as the sun was seen to be rising further to the south and thought of as “dying”.

By December the 25th, the ancient world’s solstice, it could be recognized as beginning to turn northwards again and was said to be

re-born” and therefore was proclaimed to be the birthday of the sun-deity.”

"All of the known sun-deities were 'born' on December the 25, these include Mithra, Krishna (Vishnu), Osiris, Horus, Hercules, Dionysus (Bacchus), Tammuz, Indra, Jesus Christ (via the Catholic church),

Buddha as well as the Scandinavian goddesses."

Aryan Sun Myths, The Origin of Religion ~ S.E. Titcombe

“Saturnalia was an ancient Roman festival in honor of the deity Saturn, . . . .

is a festival of light leading to the winter solstice, with the abundant presence of candles symbolizing

the quest for knowledge and truth…celebrated in the later Roman Empire at the

Dies Natalis of Sol Invictus, the "Birthday of the Unconquerable Sun," . . . .

~ Saturnalia, on Wikipedia

"Christmas": "How much the date of the festival depended upon the pagan Brumalia (Dec. 25) following the Saturnalia (Dec. 17-24), and celebrating the shortest day in the year and the 'new sun,' . . . cannot be accurately determined. The pagan Saturnalia and Brumalia were too deeply entrenched in popular custom to be set aside by Christian influence. . . . The pagan festival with its riot and merrymaking was so popular that Christians were glad of an excuse to continue its celebration with little change in spirit and in manner. Christian preachers of the West and the Near East protested against the unseemly frivolity with which Christ's birthdaywas celebrated, while Christians of Mesopotamia accused their Western brethren of idolatry and sun worship for adopting as Christian this pagan festival." ~ The New Schaff-Herzog Encyclopedia of Religious Knowledge

Brumalia ~

Brumalia was an ancient Roman, winter solstice festival honouring Saturn/Cronus and Ceres/Demeter, and Bacchus in some cases. By the Byzantine era, celebrations commenced on 24 November and lasted for a month, until Saturnalia and the "Waxing of the Light". The festival included night-time feasting, drinking, and merriment. During this time, prophetic indications were taken as prospects for the remainder of the winter. The festival was celebrated as late as the 6th century, until emperor Justinian's repression of paganism. ~ Wikipedia, Brumalia

Saturnalia ~

Saturnalia was an ancient Roman festival in honour of the god Saturn, held on 17 December of the Julian calendar and later expanded with festivities through to 23 December. The holiday was celebrated with a sacrifice at the Temple of Saturn, in the Roman Forum, and a public banquet, followed by private gift-giving, continual partying, and a carnival atmosphere that overturned Roman social norms: gambling was permitted, and masters provided table service for their slaves as it was seen as a time of liberty for both slaves and freedmen alike.[1] A common custom was the election of a "King of the Saturnalia", who would give orders to people, which were to be followed and preside over the merrymaking. The gifts exchanged were usually gag gifts or small figurines made of wax or pottery known as sigillaria. The poet Catullus called it "the best of days".[2]

"Because the Roman emperor Aurelian fixed December 25th for the winter solstice holiday in AD 274, it is thought that the early Christians adopted this day for their Christ-mass so that they would be less conspicuous in the observance of their holiday. . . . The earliest known observance of Christmas on December 25th was the year AD 336 in Rome, as recorded in a calendar of the period." ~ The Book of the Bible by Riedel, Tracy & Moskwitz

The date of December 25 is contrived from evidences of the crucifixion of Jesus Christ. Calculating that date to be March 25, Rome and the church determined he was 'conceived' and died on the same day of the month. Hence, conceived on March 25 thereby born 9 months later brings us to December 25. Rome just happened to be celebrated several pagan festivals at that time so they managed to 'justify' it without facts and to get it lost in with pagan festivities ~ according to "Inside the Vatican" in their article " The 25th of December Pagan Feast or Patristic Tradition"

The DePascha Computus, an anonymous document believed to have been written in North Africa around 243 CE, placed Jesus birth on March 28. Jesus
Clement, a bishop of Alexandria (d. ca. 215 CE), believed Jesus was born on November 18.
Joseph A. Fitzmyer – Professor Emeritus of Biblical Studies at the Catholic University of America, member of the Pontifical Biblical Commission, and former president of the Catholic Biblical Association based on historical records, guesses that Jesus birth occurred on September 11, 3 BC.

Miller, John F. "Roman Festivals," in The Oxford Encyclopedia of Ancient Greece and Rome (Oxford University Press, 2010), p. 172.
Catullus14.15 (optimo dierum), as cited by Mueller 2010, p. 221