The positions of the stars in the night sky as seen over the Caspian Sea in northern Iran on January 29, 2009 at 22:44 (10:44 P.M.) local time. Image BN4316 shows the stars as seen from the same location one hour later, demonstrating the apparent change in star positions that occurs over time as a result of the earth's rotation. (Image BN4321 shows the same image with constellation lines).