Dec. 9 Solemnity of the Immaculate Conception of the Blessed Virgin Mary, Solemnity

Today is the Solemnity of the Immaculate Conception of Mary, the solemn dogma defined by Blessed Pope Pius IX in 1854. As Our Lady Immaculately Conceived is the patroness of the United States of America, this is a holy day of obligation in the United States. The Solemnity was transferred from the 8th because of the Sunday Liturgy of Advent.