Biblical typology
Song of Songs 6:9–10
Radiant as the morning
8 One is my dove, my perfect one is but one, she is the only one of her mother, the chosen of her that bore her. The daughters saw her, and declared her most blessed: the queens and concubines, and they praised her.
9 Who is she that cometh forth as the morning rising, fair as the moon, bright as the sun, terrible as an army set in array?
Douay–Rheims · Challoner revision · Canticle of Canticles 6:8–9
The curated reference uses modern numbering. This Douay–Rheims edition reads Canticle of Canticles 6:8–9. The quoted verse numbers follow the source edition.
Why this matters
The beloved’s beauty is expressed through images of dawn, moon, and sun. Marian use is traditional poetic and liturgical interpretation; the literal poem does not identify Mary.