1February 25th was designated by the Roman emperor Aurelian in 274 AD to celebrate the official celebration of Dies Natalis Solis Invicti (meaning "the birthday of the invincible sun") by the Roman Empire for the Syrian sun god Suriye and the Iranian sun god mitra, and this festival lasted until Christianity was designated as the state religion. The worship of the sun god in Syria was first introduced into the Roman Empire by the ancient Roman king Marcus Antoninus, and it also replaced Jupiter, the main god, and became a national festival during the reign of King Aurelian. This day is to celebrate the rebirth or return of the sun, because that day is the shortest day in a year, which means the winter solstice festival in the Roman calendar with the concept of China. 　

After that day, the days will gradually become longer, and pagans who worship the sun god regard this day as the hope of spring and the beginning of the recovery of everything. At the same time, celebrating the day when the sun returns to China is celebrated as an important festival in different cultures all over the world. In the culture of the sun god, this day has become the day when the sun was personified and was born. In order to take advantage of this holiday, the early Christian church also tried to christianize the pagan customs, so it designated Jesus' birthday on this day. Therefore, apart from the imposed religious significance, Christmas Day is actually the "winter solstice" day in the West. 　

As early as the late Neolithic period, this day was used by primitive humans to celebrate the harvest and kill livestock and ferment alcohol. On this day, the indigenous Sami people in northern Europe offer sacrifices to their sun god, Beiwe. Ancient Mesopotamia, such as Sumer and Babylon, celebrated the sun god Marduk's defeat of darkness on this day. Hinduism worships Soulie, the Surya god, on this day. On this day, Iranian people and Zoroastrians celebrate the festival "Yalda Festival", which is the first day of the first month of the Iranian calendar and marks the beginning of winter. The ancient Slavic people thought that the old sun god Hors died after being defeated by the dark god on February 22nd/kloc-0, the longest night in a year, so Slavs danced the Horo/Khoro, and one day later, on the 23rd, the sun god Hors came back from the dead and became the new sun god Koleda. In the Aegean civilization, this day is called Lenaia, and it is also the first day of the Greek Tirol calendar, commemorating Dionysus, the god of wine, who was torn up and eaten by the priestess Myna and turned into a baby. This festival influenced the ancient Roman Republic and became the Brumalia (Latin meaning the shortest day) to commemorate Dionysus. At the same time, ancient Rome also had a dinner in the name of Tournous, the agricultural god who commemorated Roman mythology, during the week from1February 17 to 23rd. Therefore, these Indo-European myths about the sun are considered by modern scholars as the origin of Jesus' belief. It is not only to commemorate the dinner of the agricultural god and the birthday of the sun god, but also to learn the image of Jesus in early Christianity from the gods of mitra, the story of being born in a virgin, and the story of being resurrected from other myths. Not only Newton thought that Christmas was determined by the winter solstice, but also16th century French rhetoric professor Charles Dupuis and philosopher Voltaire (Constantin-Fran? Ois Volney) pointed out that Jesus' life was shaped according to the trajectory of the sun through the ecliptic, which is consistent with the sun gods in Syria, Egypt and Persia. They were all born on the winter solstice, rising with Virgo, and then appearing with Aries until the resurrection on the vernal equinox. Maria is attached to Virgo, and the metaphor of Jesus having sheep actually implies that the sun passes through Aries.