One of the constellations. (August 23rd to September 23rd.)
Astræa, goddess of justice, was the last of the deities to quit our earth, and when she returned to heaven became the constellation Virgo.
“When the bright Virgin gives the beauteous days.”
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Virgin from Infoplease: