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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 June 5   
      
                               Savudrija Star Trails   
                       Image Credit & Copyright: Branko Nadj   
      
      Explanation: Savudrija lighthouse shines along the coast near the   
      northern end of the Istrian peninsula in this well-composed night   
      skyscape. A navigational aid for sailors on the Adriatic Sea, the   
      historic lighthouse was constructed in the early 19th century. But an   
      even older aid to navigation shines in the sky above, Polaris, alpha   
      star of the constellation Ursa Minor and also known as the North Star.   
      In this scene Polaris forms the shortest bright arc near the North   
      Celestial Pole, the extension of Earth's axis of rotation into space.   
      Of course, the North Celestial Pole lies exactly at the center of all   
      the concentric startrails. The composite image is a digital stack of   
      400 exposures, each 30 seconds long, taken with camera and tripod fixed   
      to a rotating planet.   
      
                        Tomorrow's picture: pixels in space   
        __________________________________________________________________   
      
          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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