The Solemnity of the Immaculate Conception is celebrated on December 8th. It is a Holy Day of Obligation. (The Apostolic Constitution which declared the Immaculate Conception a Dogma is Ineffabilis Deus.)

The Feast of Mary's Conception is clearly known as early as the 7th century in the East, and may even date to as early as the 5th century in the Churches of Syria. The feast spread to the West, at least by the 9th century. The feast and doctrine initially were opposed by the Dominicans, while the Franciscans argued in favor of the Immaculate Conception and its feast. For awhile, a great debate raged about the doctrine, even up until the 19th century. The Council of Basle in 1439 affirmed that the Immaculate Conception was a pious belief in accord with the Catholic faith. In 1476 Pope Sixtus IV approved the feast with its own Mass and Office, and in 1708, Pope Clement XI extended the feast to the universal Church, making it a holy day of obligation. The Orthodox and many Eastern Catholics celebrate the Feast of the Conception of Mary on December 9. This places Mary's conception 9 months, minus a day, from her birth (celebrated September 8). This apparently symbolizes that while Christ had a perfect humanity, even though Mary was the Mother of God, she did not (since Christ spent 9 full months in the womb, from March 25-December 25). However, the Orthodox do not celebrate Mary's immaculate conception on December 9 as Eastern Catholics do. The West observes the feast on December 8. While this dogma took centuries to develop and unfold, as did the dogma of the Trinity, the doctrine of the Immaculate Conception is certainly fitting for one whom the Eastern Christians call panagia, i.e. "all-holy," and who bore God-Made-Man, Jesus Christ.

From ChurchYear.Net

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