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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 September 18   
      
                        Analemma over the Callanish Stones   
                    Image Credit & Copyright: Giuseppe Petricca   
      
      Explanation: If you went outside at the same time every day and took a   
      picture that included the Sun, how would the Sun's position change? A   
      more visual answer to that question is an analemma, a composite image   
      taken from the same spot at the same time over the course of a year.   
      The featured analemma was composed from images taken every few days at   
      noon near the village of Callanish in the Outer Hebrides in Scotland,   
      UK. In the foreground are the Callanish Stones, a stone circle built   
      around 2700 BC during humanity's Bronze Age. It is not known if the   
      placement of the Callanish Stones has or had astronomical significance.   
      The ultimate causes for the figure-8 shape of this and all analemmas   
      are the tilt of the Earth axis and the ellipticity of the Earth's orbit   
      around the Sun. At the solstices, the Sun will appear at the top or   
      bottom of an analemma. The featured image was taken near the December   
      solstice and so the Sun appears near the bottom. Equinoxes, however,   
      correspond to analemma middle points -- not the intersection point.   
      This coming Friday at 1:04 am (UT) -- Thursday in the Americas -- is   
      the equinox ("equal night"), when day and night are equal over all of   
      planet Earth. Many cultures celebrate a change of season at an equinox.   
      
                   Explore Your Universe: Random APOD Generator   
                        Tomorrow's picture: lightning layer   
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