The doctrine of the immaculate conception (Mary being conceived free from original sin) is not to be confused with her virginal conception of her son Jesus. This misunderstanding of the term immaculate conception is frequently met in the mass media. Catholics believe that Mary was not the product of a virginal conception herself but was the daughter of a human father and mother, traditionally known by the names of Saint Joachim and Saint Anne. In 1677, the Holy See condemned the belief that Mary was virginally conceived, which had been a belief surfacing occasionally since the 4th century. The Church celebrates the Feast of the Immaculate Conception (when Mary was conceived free from original sin) on 8 December, exactly nine months before celebrating the Nativity of Mary. The feast of the Annunciation (which commemorates the virginal conception and the Incarnation of Jesus) is celebrated on 25 March, nine months before Christmas Day.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What other event is the immaculate conception similar to?
unanswerable