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The Angel Gabriel appeared to Mary to announce the birth of Christ. Here are eight things to know and share about the event and how we celebrate it.

We are celebrating the solemnity of the Annunciation.

This day celebrates the appearance of the Angel Gabriel to the Virgin Mary to announce of the birth of Christ.

What’s going on and why is this day important?

Here are eight things you need to know.

1. What does the word “Annunciation” mean?

It's derived from the same root as the word “announce.” Gabriel is announcing the birth of Christ in advance.

“Annunciation” is simply an old-fashioned way of saying “announcement.”

Although we are most familiar with this term being applied to the announcement of Christ's birth, it can be applied in other ways also.

For example, in his book Jesus of Nazareth 3: The Infancy Narratives, Benedict XVI has sections on both “the annunciation of the birth of John” and “the annunciation to Mary,” because John the Baptist's birth was also announced in advance.

2. When is the Annunciation normally celebrated and why does it sometimes move?

Normally the Solemnity of the Annunciation is celebrated March 25.

This date is used because it is nine months before Christmas (Dec. 25), and it is assumed that Jesus spent the normal nine months in the womb.

However, March 25 sometimes falls during Holy Week, and the days of Holy Week have a higher liturgical rank than this solemnity (weekdays of Holy Week have rank I:2, while this solemnity has a rank of I:3; see here for the Table of Liturgical Days by their ranks).

Still, the Annunciation is an important solemnity, and so it doesn’t just vanish from the calendar. Instead, as the rubrics in the Roman Missal note:

Whenever this Solemnity occurs during Holy Week, it is transferred to the Monday after the Second Sunday of Easter.
 It is thus celebrated on the first available day after Holy Week and the Octave of Easter (which ends on the Second Sunday of Easter).

3. How does this story parallel the birth of John the Baptist?

As noted above, John the Baptist's birth was announced in advance also. In both stories there are multiple parallels:

• The Angel Gabriel makes the announcement.
• He announces to a single individual: Zechariah in John the Baptist's case and Mary in Jesus' case.
• He announces the miraculous birth of an individual who has a prominent place in God's plan.
• He is met with a question in both cases (Zechariah asks how he can know this will happen; Mary asks how it will happen)
• A miraculous sign is offered as evidence (Zechariah is struck dumb; Mary is told of Elizabeth's miraculous pregnancy, which is in its sixth month) 
• Gabriel departs.

4. How is Mary’s reaction different than Zechariah’s?

At first glance, Mary’s reaction to Gabriel could appear like Zechariah’s unbelieving reaction, but it is fundamentally different.

Like Zechariah, she asks a question, but it is a question of a different sort:

• Zechariah asked how he could know what the angel says would be true. His attitude was one of skepticism.
• Mary does not ask for proof. Instead, she asks how the angel’s words will be fulfilled. He accepts what he says and wants to understand specifically how it will take place. Her attitude is thus one of faith seeking understanding, not a lack of faith.

5. What does Mary’s reaction say about her perpetual virginity?

Mary’s question is translated in the RSV:CE as “How shall this be, since I have no husband?”

This is not a good translation, because she does, in fact, have a husband: Joseph. Luke has already told us that she is betrothed to Joseph, which means that they were legally married (thus Joseph would have had to divorce her, not just "break the engagement" as one might today; cf. Matthew 1:19).

What the text literally says in Greek is “since I do not know man.”

This relies on the common biblical euphemism of "knowing" for sexual relations. Mary's question indicates that she understands the facts of life, and it is surprising since she is legally married and awaiting the time that she and Joseph would begin to cohabit.

If she were planning on an ordinary marriage then the most natural interpretation of the angel's statement would be that, after she and Joseph begin to cohabit, they will together conceive a child, who the angel is now telling her about.

6. How does Gabriel respond to Mary’s question?

Gabriel informs her:

The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy, the Son of God.

Here Gabriel indicates the involvement of all three Persons of the Trinity: Through the action of the Holy Spirit, the Father causes the Son to be conceived in human form. There will be no human father, making clear the fact that the child will be the Son of God.

As a further illustration of God’s power, he points to the fact that Elizabeth, though old and apparently barren, has miraculously conceived a son and is in her sixth month of pregnancy. “For with God nothing will be impossible.”

7. Is Elizabeth Mary’s “Cousin?”

This question sometimes comes up in discussions of Mary’s perpetual virginity, because it is sometimes thought that the “brothers” of the Lord were his cousins and that they are described as brothers because Aramaic has no word for “cousin.”

Yet the New American Bible described Elizabeth as Mary’s cousin.

Who Jesus “brothers” were has been understood in different ways. The earliest sources that comment on the question (including the second-century Protoevangelium of James) say that they were step-brothers through Joseph. They also, hypothetically, could have been adopted (adoption was very common in the ancient world since people often died early). So they need not have been cousins.

While it’s true that Aramaic does not have a word for cousin, Greek does (anepsios), but that is not the word used here.

Despite the well-known mistranslation in the NAB (later corrected in the NAB:RE), Elizabeth is not described as Mary’s “cousin.” The Greek word in this passage (sungenis) indicates a female relative — a kinswoman — not a cousin in particular.

8. Why is Mary’s “Fiat” (Latin, “Let it be”) important?

Mary's acceptance of this role is momentous and will entail suffering. It is momentous because she will be the mother of the Son of God himself. It will entail suffering in ways that she cannot yet foresee (e.g., witnessing the Crucifixion), but some she could foresee.

In particular, she will be regarded as having been unfaithful to Joseph, and that would involve not only public shame but, as Matthew records, endangered her relationship with Joseph and her future livelihood and social position. Yet she placed herself completely at the service of God's will.

Commenting on this, Pope Benedict writes:

In one of his Advent homilies, Bernard of Clairvaux offers a stirring presentation of the drama of this moment. After the error of our first parents, the whole world was shrouded in darkness, under the dominion of death. Now God seeks to enter the world anew. He knocks at Mary’s door. He needs human freedom. The only way he can redeem man, who was created free, is by means of a free ‘yes’ to his will. In creating freedom, he made himself in a certain sense dependent upon man. His power is tied to the unenforceable ’yes’ of a human being.

So Bernard portrays heaven and earth as it were holding its breath at this moment of the question addressed to Mary. Will she say yes? She hesitates … will her humility hold her back? Just this once — Bernard tells her — do not be humble but daring! Give us your 'yes'! This is the crucial moment when, from her lips, from her heart, the answer comes: ‘Let it be to me according to your word.’ It is the moment of free, humble yet magnanimous obedience in which the loftiest choice of human freedom is made. (Jesus of Nazareth 3: The Infancy Narratives, ch. 2)