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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 w   
                       ritten by a professional astronomer.   
      
                                  2021 November 14   
      
                       How to Identify that Light in the Sky   
          Illustration Credit & Copyright: HK (The League of Lost Causes)   
      
      Explanation: What is that light in the sky? Perhaps one of humanity's   
      more common questions, an answer may result from a few quick   
      observations. For example -- is it moving or blinking? If so, and if   
      you live near a city, the answer is typically an airplane, since planes   
      are so numerous and so few stars and satellites are bright enough to be   
      seen over the din of artificial city lights. If not, and if you live   
      far from a city, that bright light is likely a planet such as Venus or   
      Mars -- the former of which is constrained to appear near the horizon   
      just before dawn or after dusk. Sometimes the low apparent motion of a   
      distant airplane near the horizon makes it hard to tell from a bright   
      planet, but even this can usually be discerned by the plane's motion   
      over a few minutes. Still unsure? The featured chart gives a   
      sometimes-humorous but mostly-accurate assessment. Dedicated sky   
      enthusiasts will likely note -- and are encouraged to provide -- polite   
      corrections.   
      
          Chart translations: Spanish, Italian, Polish, Kannada, Latvian,   
                              Norwegian, and Turkish   
                     Tomorrow's picture: volcanic light pillar   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
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