The Greeks called her Eos, the Romans called her Aurora. She was supposed to run ahead of the four stallions pulling the carriage of her brother Helios (Sol for the Romans) and announce him on his track over the sky. Their other sister, Selene (Luna for the Romans), is following the carriage as the last light of the day.
In this image, we have, besides the first light of the day, the first-morning fog, and the last stars in the sky. It’s taken literally between night and day.