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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 May 19   
      
                              A Digital Lunar Eclipse   
                      Image Credit & Copyright: Michael Cain   
      
      Explanation: Recorded on May 15/16 this sequence of exposures follows   
      the Full Moon during a total lunar eclipse as it arcs above treetops in   
      the clearing skies of central Florida. A frame taken every 5 minutes by   
      a digital camera shows the progression of the eclipse over three hours.   
      The bright lunar disk grows dark and red as it glides through planet   
      Earth's shadow. In fact, counting the central frames in the sequence   
      measures the roughly 90 minute duration of the total phase of this   
      eclipse. Around 270 BC, the Greek astronomer Aristarchus also measured   
      the duration of total lunar eclipses, but probably without the benefit   
      of digital watches and cameras. Still, using geometry he devised a   
      simple and impressively accurate way to calculate the Moon's distance   
      in terms of the radius of planet Earth, from the eclipse duration.   
      
                  Tomorrow's picture: a view from Earth's shadow   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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                                & Michigan Tech. U.   
      
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