Today is the feast of St. Lawrence of Brindisi, Doctor of the Church. From his Mariale, a work highly influential on modern Catholic views of the Holy Virgin (Sermon 1), discussing the vision of the Woman and the Sun in Revelation 12:
By this heavenly vision God wanted the orthodox Church to demonstrate the divine wonders of Mary and to reveal to the faithful those things hidden in the Virgin, that all might know of what kind and how great is the glory of the Virgin from those things which had been written of her.
To summarize, there are two things that have been divinely handed down to us about the Virgin: that she was the Bride of God and Mother of Christ, just as Eve was the wife of Adam and the mother of men. So too in this vision these two things have been presented to human minds: that she is the Bride of God, the Queen of Heaven, the Bride of the High King, and that she conceived and gave birth to Christ, the only-begotten Son of God and true God. But what kind of glory accompanies these two things! He shows her robe, throne, and crown: A woman clothed with the sun, and the moon under her feet, and on her head a crown of twelve stars. O wonderful vision!