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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                 2022 December 27   
       The featured image shows two complete circular rainbows centered on a   
         mountainous island. Please see the explanation for more detailed   
                                   information.   
      
                         A Full Circle Rainbow over Norway   
                      Image Credit & Copyright: Lukas Moesch   
      
      Explanation: Have you ever seen an entire rainbow? From the ground,   
      typically, only the top portion of a rainbow is visible because   
      directions toward the ground have fewer raindrops. From the air,   
      though, the entire 360-degree circle of a rainbow is more commonly   
      visible. Pictured here, a full-circle rainbow was captured over the   
      Lofoten Islands of Norway in September by a drone passing through a   
      rain shower. An observer-dependent phenomenon primarily caused by the   
      internal reflection of sunlight by raindrops, the rainbow has a full   
      diameter of 84 degrees. The Sun is in the exact opposite direction from   
      the rainbow's center. As a bonus, a second rainbow that was more faint   
      and color-reversed was visible outside the first.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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