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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 19   
       A grand Mayan Pyramids is shown below a starry sky highlighted by the   
       band of the Milky Way and the planets Saturn and Jupiter. Please see   
                  the explanation for more detailed information.   
      
                  Equinox at the Pyramid of the Feathered Serpent   
                      Image Credit & Copyright: Robert Fedez   
      
      Explanation: To see the feathered serpent descend the Mayan pyramid   
      requires exquisite timing. You must visit El Castillo -- in Mexico's   
      Yucat+ín Peninsula -- near an equinox. Then, during the late afternoon   
      if the sky is clear, the pyramid's own shadows create triangles that   
      merge into the famous illusion of a slithering viper. Also known as the   
      Temple of Kukulkan, the impressive step-pyramid stands 30 meters tall   
      and 55 meters wide at the base. Built up as a series of square terraces   
      by the pre-Columbian civilization between the 9th and 12th century, the   
      structure can be used as a calendar and is noted for astronomical   
      alignments. The featured composite image was captured in 2019 with   
      Jupiter and Saturn straddling the diagonal central band of our Milky   
      Way galaxy. Tomorrow marks another equinox -- not only at Temple of   
      Kukulc+ín, but all over planet Earth.   
      
                      Tomorrow's picture: expanding supernova   
        __________________________________________________________________   
      
          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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