Moon Ring

A haloed moon rises above roofs in the Brentwood Drive NE neighborhood area of Cedar Rapids, Iowa around 6:05 PM, Saturday, January 7, 2012. Haloes are caused by refracted light passing through ice crystals in cirriform clouds that lie between the observer and the light source. This optical phenomena was short-lived however. Within an hour a heavier veil of clouds obscured all but the bright disk of the moon. The moon was in its waxing gibbous phase, just two days from full. Air temperature was 33 degrees F at this moment. This image was captured as a three-second exposure at f/7.1, 2000 ISO, 18mm focal length.