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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.   
      
                                 2025 September 11   
      
                                The Umbra of Earth   
               Image Credit & Copyright: Wang Letian (Eyes at Night)   
      
      Explanation: The dark, inner shadow of planet Earth is called the   
      umbra. Shaped like a cone extending into space, it has a circular cross   
      section most easily seen during a lunar eclipse. And on the night of   
      September 7/8 the Full Moon passed near the center of Earth's umbral   
      cone, entertaining eclipse watchers around much of our fair planet,   
      including parts of Antarctica, Australia, Asia, Europe, and Africa.   
      Recorded from Zhangjiakou City, China, this timelapse composite image   
      uses successive pictures from the total lunar eclipse, progressing left   
      to right, to reveal the curved cross-section of the umbral shadow   
      sliding across the Moon. Sunlight scattered by the atmosphere into   
      Earth's umbra causes the lunar surface to appear reddened during   
      totality. But close to the umbra's edge, the limb of the eclipsed Moon   
      shows a distinct blue hue. The blue eclipsed moonlight originates as   
      rays of sunlight pass through layers high in the upper stratosphere,   
      colored by ozone that scatters red light and transmits blue. In the   
      total phase of this leisurely lunar eclipse, the Moon was completely   
      within the Earth's umbra for about 83 minutes.   
      
                   Tomorrow's picture: a tale of two hemispheres   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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