Today is Holy Tuesday and the Feast of the Annunciation of the Theotokos

Apolytikion:

"Today marks the crowning of our salvation and the revelation of the mystery before all ages. For the Son of God becomes the son of the Virgin, and Gabriel proclaims the grace. Wherefore, we also cry out with him, "Hail, O full of grace, the Lord is with you.""

(found here, with an explanation of the Feast)