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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.   
      
                                   2023 July 23   
       An old and corroded mechanism is shown fronted by a large wheel. The   
       mechanism has patches of tan and brown color but it is mostly green.   
             Please see the explanation for more detailed information.   
      
                             The Antikythera Mechanism   
                    Image Credit & License: Marsyas, Wikipedia   
      
      Explanation: It does what? No one knew that 2,000 years ago, the   
      technology existed to build such a device. The Antikythera mechanism,   
      pictured, is now widely regarded as the first computer. Found at the   
      bottom of the sea aboard a decaying Greek ship, its complexity prompted   
      decades of study, and even today some of its functions likely remain   
      unknown. X-ray images of the device, however, have confirmed that a   
      main function of its numerous clock-like wheels and gears is to create   
      a portable, hand-cranked, Earth-centered, orrery of the sky, predicting   
      future star and planet locations as well as lunar and solar eclipses.   
      The corroded core of the Antikythera mechanism's largest gear is   
      featured, spanning about 13 centimeters, while the entire mechanism was   
      33 centimeters high, making it similar in size to a large book.   
      Recently, modern computer modeling of missing components is allowing   
      for the creation of a more complete replica of this surprising ancient   
      machine.   
      
                        Tomorrow's picture: rainbow meteor   
        __________________________________________________________________   
      
          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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