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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.   
      
                                  2022 October 10   
      
                        A Double Lunar Analemma over Turkey   
                      Image Credit & Copyright: Betul Turksoy   
      
      Explanation: An analemma is that figure-8 curve you get when you mark   
      the position of the Sun at the same time each day for one year. But the   
      trick to imaging an analemma of the Moon is to wait bit longer. On   
      average the Moon returns to the same position in the sky about 50   
      minutes and 29 seconds later each day. So photograph the Moon 50   
      minutes 29 seconds later on successive days. Over one lunation or lunar   
      month it will trace out an analemma-like curve as the Moon's actual   
      position wanders due to its tilted and elliptical orbit. Since the   
      featured image was taken over two months, it actually shows a double   
      lunar analemma. Crescent lunar phases too thin and faint to capture   
      around the New moon are missing. The two months the persistent   
      astrophotographer chose were during a good stretch of weather during   
      July and August, and the location was Kayseri, Turkey   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          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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