The Feast of the Immaculate Conception celebrates belief in the Immaculate Conception of the Blessed Virgin Mary. It is universally celebrated on December 8, nine months before the feast of the Nativity of Mary, which is celebrated on September 8.
It is the patronal feast day of Spain, Korea, Portugal, Nicaragua, Brazil, the Philippines and the United States of America. It is celebrated by the Roman Catholic Church as well as a few other closely related Christian churches.

The Immaculate Conception
Francisco Zurbarán
Note the inverted moon and various imagery in reference to the Marian titles of Litany of Loreto.
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