"For quivering are the Fishes on the horizon, And the Wain wholly over Caurus lies"

Pisces, or the Fishes
Creative Commons Attribution Share AlikePisces, or the Fishes - Credit: Till Credner

(Canto 11, lines 113-114)

The Fishes (Pisces) are one of the constellations of the Zodiac and the one immediately preceding Aries, where the Sun stands at the time of year that Dante travels through Inferno. If the Fishes start showing it means that it is only about three hours until sunrise. The Wain is another name for the Big Dipper, the brightest seven stars of the constellation Ursa Major; Caurus, the direction of the North-West wind. This position as well indicates that only a couple of hours remain until sunrise.