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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.   
      
                                 2024 September 21   
      
                            Sunrise Shadows in the Sky   
                     Image Credit & Copyright: Emili Vilamala   
      
      Explanation: The defining astronomical moment of this September's   
      equinox is at 12:44 UTC on September 22, when the Sun crosses the   
      celestial equator moving south in its yearly journey through planet   
      Earth's sky. That marks the beginning of fall for our fair planet in   
      the northern hemisphere and spring in the southern hemisphere, when day   
      and night are nearly equal around the globe. Of course, if you   
      celebrate the astronomical change of seasons by watching a sunrise you   
      can also look for crepuscular rays. Outlined by shadows cast by clouds,   
      crepuscular rays can have a dramatic appearance in the twilight sky   
      during any sunrise (or sunset). Due to perspective, the parallel cloud   
      shadows will seem to point back to the rising Sun and a place due east   
      on your horizon on the equinox date. But in this spectacular sunrise   
      skyscape captured in early June, the parallel shadows and crepuscular   
      rays appear to converge toward an eastern horizon's more northerly   
      sunrise. The well-composed photo places the rising Sun just behind the   
      bell tower of a church in the town of Vic, province of Barcelona,   
      Catalonia, Spain.   
      
                      Tomorrow's picture: Equinox in the City   
        __________________________________________________________________   
      
          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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