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Christmas (Old English: Crīstesmæsse, meaning "Christ's Mass") is an annual commemoration of the birth of Jesus Christ and a widely observed holiday, celebrated generally on December 25 by millions of people around the world.

A feast central to the Christian liturgical year, it closes the Advent season and initiates the twelve days of Christmastide.Christmas is a civil holiday in many of the world's nations,is celebrated by an increasing number of non-Christians,and is an integral part of the Christmas and holiday season.

The precise year of Jesus' birth, which some historians place between 7 and 2 BC, is unknown. His birth is mentioned in two of the four canonical gospels. By the early-to-mid 4th century, the Western Christian Church had placed Christmas on December 25, a date later adopted in the East.

The date of Christmas may have initially been chosen to correspond with the day exactly nine months after early Christians believed Jesus to have been conceived, as well as the date of celebration of the southern solstice (i.e., the Roman winter solstice), with a sun connection being possible because Christians consider Jesus to be the "Sun of righteousness" prophesied in Malachi 4:2.

The original date of the celebration in Eastern Christianity was January 6, in connection with Epiphany, and that is still the date of the celebration for the Armenian Apostolic Church and in Armenia, where it is a public holiday. As of 2012, there is a difference of 13 days between the modern Gregorian calendar and the older Julian calendar.

Those who continue to use the Julian calendar or its equivalents thus celebrate December 25 and January 6 on what for the majority of the world is January 7 and January 19. For this reason, Ethiopia, Russia, Ukraine, Serbia, the Republic of Macedonia, and the Republic of Moldova celebrate Christmas on what in the Gregorian calendar is January 7; the Church of Greece and all Greek Orthodox Churches celebrate Christmas on December 25.

The popular celebratory customs associated in various countries with Christmas have a mix of pre-Christian, Christian, and secular themes and origins.

Popular modern customs of the holiday include gift giving, Christmas music and caroling, an exchange of Christmas cards, church celebrations, a special meal, and the display of various Christmas decorations, including Christmas trees, Christmas lights, nativity scenes, garlands, wreaths, mistletoe, and holly.

In addition, several closely related and often interchangeable figures, known as Santa Claus, Father Christmas, Saint Nicholas, and Christkind, are associated with bringing gifts to children during the Christmas season and have their own body of traditions and lore.

Because gift-giving and many other aspects of the Christmas festival involve heightened economic activity among both Christians and non-Christians, the holiday has become a significant event and a key sales period for retailers and businesses. The economic impact of Christmas is a factor that has grown steadily over the past few centuries in many regions of the world.

Commemorating Jesus' birth
Christians celebrate the birth of Jesus to the Virgin Mary as a fulfillment of the Old Testament's Messianic prophecy. The Bible contains two accounts which describe the events surrounding Jesus' birth. Depending on one's perspective, these accounts either differ from each other or tell two versions of the same story.

These biblical accounts are found in the Gospel of Matthew, namely Matthew 1:18, and the Gospel of Luke, specifically Luke 1:26 and 2:40. According to these accounts, Jesus was born to Mary, assisted by her husband Joseph, in the city of Bethlehem.

On Christmas Day, the Christ Candle in the center of the Advent wreath is traditionally lit in many church services.

According to popular tradition, the birth took place in a stable, surrounded by farm animals. A manger (that is, a feeding trough) is mentioned in Luke 2:7, where it states Mary "wrapped him in swaddling clothes and laid him in a manger, because there was no room for them in the inn" (KJV); and "She wrapped him in cloths and placed him in a manger, because there was no guest room available for them" (NIV). Shepherds from the fields surrounding Bethlehem were told of the birth by an angel, and were the first to see the child.

Popular tradition also holds that three kings or wise men (named Melchior, Caspar, and Balthazar) visited the infant Jesus in the manger, though this does not strictly follow the Biblical account.

The Gospel of Matthew instead describes a visit by an unspecified number of magi, or astrologers, sometime after Jesus was born while the family was living in a house (Matthew 2:11), who brought gifts of gold, frankincense, and myrrh to the young child Jesus.

The visitors were said to be following a mysterious star, commonly known as the Star of Bethlehem, believing it to announce the birth of a king of the Jews. The commemoration of this visit, the Feast of Epiphany celebrated on January 6, is the formal end of the Christmas season in some churches.

Christians celebrate Christmas in various ways. In addition to this day being one of the most important and popular for the attendance of church services, there are other devotions and popular traditions. In some Christian denominations, children re-enact the events of the Nativity with animals to portray the event with more realism or sing carols that reference the event.

Some Christians also display a small re-creation of the Nativity, known as a Nativity scene or crèche, in their homes, using figurines to portray the key characters of the event. Prior to Christmas Day, the Eastern Orthodox Church practices the 40-day Nativity Fast in anticipation of the birth of Jesus, while much of Western Christianity celebrates four weeks of Advent.

The final preparations for Christmas are made on Christmas Eve, and many families' major observation of Christmas actually falls in the evening of this day.

A long artistic tradition has grown of producing painted depictions of the nativity in art. Nativity scenes are traditionally set in a stable with livestock and include Mary, Joseph, the infant Jesus in the manger, the three wise men, the shepherds and their sheep, the angels, and the Star of Bethlehem.

Source: Wikipedia