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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 March 11   
      
                                When Rainbows Smile   
                  Image Credit & Copyright: Marcella Giulia Pace   
      
      Explanation: Want to see a rainbow smile? Look near the zenith   
      (straight up) when the sun is low in the sky and you might. This   
      example of an ice halo known as a circumzenithal arc was captured above   
      a palm tree top from Ragusa, Sicily on February 24. The vividly   
      colorful arcs are often called smiling rainbows because of their upside   
      down curvature and colors. For circumzenithal arcs the zenith is at the   
      center and red is on the outside, compared to rainbows whose arcs bend   
      toward the horizon after a downpour. True rainbows are formed by water   
      droplets refracting the sunlight to produce a spectrum of colors,   
      though. Circumzenithal arcs are the product of refraction and   
      reflection in flat hexagonal ice crystals, like the ice crystals that   
      create sundogs, formed in high thin clouds.   
      
                          Tomorrow's picture: winging it   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
   --- BBBS/Li6 v4.10 Toy-5   
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