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   Lunar fogbows 

Ohio lunar fogbow. At night under a clear sky the ground radiates heat away to space. The surface cools and this in turn cools the adjacent air to form a radiation fog. If there is a bright enough moon then a lunar fogbow might be visible. This example was imaged by Michael Ellestad (atmospheric optics site) in October 2004. A broad supernumerary arc is visible inside the main bow. Another lunar fogbow©2004 Michael Ellestad, shown with permission.