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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 July 2   
      
                              Solargraphic Analemmas   
                Image Credit & Copyright: Dawid Rycabel (Pinholove)   
      
      Explanation: For the northern hemisphere June 21 was the summer   
      solstice, the Sun reaching its northernmost declination for the year.   
      That would put it at the top of each of these three figure-8 curves, or   
      analemmas, as it passed through the daytime sky over the village of   
      Proboszczow, Poland. No sequence of digital exposures was used to   
      construct the remarkable image though. Using a pinhole camera fixed to   
      face south during the period June 26, 2021 to June 26, 2022, the image   
      was formed directly on a single sheet of photographic paper, a   
      technique known as solargraphy. The three analemmas are the result of   
      briefly exposing the photo paper through the pinhole each day at 11:00,   
      12:00, and 13:00 CET. Groups of dashed lines on the sides show partial   
      tracks of the Sun from daily exposures made every 15 minutes. Over the   
      year-long solargraphic photo opportunity clouds blocking the Sun during   
      the pinhole exposures created the dark gaps.   
      
                      Tomorrow's picture: doomed moon of Mars   
        __________________________________________________________________   
      
          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   
                                & Michigan Tech. U.   
      
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