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   CHRS: LATIN-1 2   
                           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.   
      
                                 2023 September 23   
      
                                Afternoon Analemma   
               Image Credit & Copyright: Ian Griffin (Otago Museum)   
      
      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. To make   
      this one, a 4x5 pinhole camera was set up looking north in southern New   
      Zealand skies. The shutter was briefly opened each clear day in the   
      afternoon at 4pm local time exposing the same photosensitized glass   
      plate for the year spanning September 23, 2022 to September 19, 2023.   
      On two days, the winter and summer solstices, the shutter was opened   
      again 15 minutes after the main exposure and remained open until sunset   
      to create the sun trails at the bottom and top of the curve. The   
      equinox dates correspond to positions in the middle of the curve, not   
      the crossover point. Of course, the curve itself is inverted compared   
      to an analemma traced from the northern hemisphere. And while fall   
      begins today at the Autumnal Equinox for the northern hemisphere, it's   
      the Spring Equinox in the south.   
      
                     Tomorrow's picture: sunrise solar eclipse   
        __________________________________________________________________   
      
          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.   
      
   --- BBBS/Li6 v4.10 Toy-6   
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