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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.   
      
                                   2023 March 13   
      A grassy hill is seen topped by a small tree. The tree appears to be at   
       the end of a bright and colorful rainbow. Please see the explanation   
                          for more detailed information.   
      
                                   Rainbow Tree   
                       Image Credit & Copyright: Eric Houck   
      
      Explanation: What lies at the end of a rainbow? Something different for   
      everyone. For the photographer taking this picture, for example, one   
      end of the rainbow ended at a tree. Others nearby, though, would likely   
      see the rainbow end somewhere else. The reason is because a rainbow's   
      position depends on the observer. The center of a rainbow always   
      appears in the direction opposite the Sun, but that direction lines up   
      differently on the horizon from different locations. This rainbow's arc   
      indicates that its center is about 40 degrees to the left and slightly   
      below the horizon, while the Sun is well behind the camera and just   
      above the horizon. Reflections and refractions of sunlight from   
      raindrops in a distant storm in the direction of the rainbow are what   
      causes the colorful bands of light. This single exposure image was   
      captured in early January near Knight's Ferry, California, USA.   
      
                       Tomorrow's picture: Soul of the night   
        __________________________________________________________________   
      
          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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