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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 December 21   
      
                           Solstice on a Spinning Earth   
         Image Credit: Meteosat 9, NASA, Earth Observatory, Robert Simmon   
      
      Explanation: Can you tell that today is a solstice by the tilt of the   
      Earth? Yes. At a solstice, the Earth's terminator -- the dividing line   
      between night and day -- is tilted the most. The featured time-lapse   
      video demonstrates this by displaying an entire year on planet Earth in   
      twelve seconds. From geosynchronous orbit, the Meteosat 9 satellite   
      recorded infrared images of the Earth every day at the same local time.   
      The video started at the September 2010 equinox with the terminator   
      line being vertical: an equinox. As the Earth revolved around the Sun,   
      the terminator was seen to tilt in a way that provides less daily   
      sunlight to the northern hemisphere, causing winter in the north. At   
      the most tilt, winter solstice occurred in the north, and summer   
      solstice in the south. As the year progressed, the March 2011 equinox   
      arrived halfway through the video, followed by the terminator tilting   
      the other way, causing winter in the southern hemisphere -- and summer   
      in the north. The captured year ends again with the September equinox,   
      concluding another of the billions of trips the Earth has taken -- and   
      will take -- around the Sun.   
      
                   APOD Review: RJN's Night Sky Network Lecture   
                       Tomorrow's picture: strange lightning   
        __________________________________________________________________   
      
          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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