Jusqu'à combien de semaines Annunciation of the Lord - GR?

The Annunciation (from the Vulgate Latin annuntiatio (or nuntiatio) nativitatis Christi), also referred to as the Annunciation to the Blessed Virgin Mary, the Annunciation of Our Lady or the Annunciation of the Lord, is the Christian celebration of the announcement by the angel Gabriel to the Virgin Mary that she would conceive and become the mother of Jesus, the Son of God, marking his Incarnation. Gabriel told Mary to name her son Yehoshua , meaning "YHWH is salvation". See wikipedia for more details.