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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 January 27   
      
                             Western Moon, Eastern Sea   
                        Image Credit & Copyright: Tom Glenn   
      
      Explanation: The Mare Orientale, Latin for Eastern Sea, is one of the   
      most striking large scale lunar features. The youngest of the large   
      lunar impact basins it's very difficult to see from an earthbound   
      perspective. Still, taken during a period of favorable tilt, or   
      libration of the lunar nearside, the Eastern Sea can be found near top   
      center in this sharp telescopic view, extremely foreshortened along the   
      Moon's western edge. Formed by the impact of an asteroid over 3 billion   
      years ago and nearly 1000 kilometers across, the impact basin's   
      concentric circular features, ripples in the lunar crust, are a little   
      easier to spot in spacecraft images of the Moon, though. So why is the   
      Eastern Sea at the Moon's western edge? The Mare Orientale lunar   
      feature was named before 1961. That's when the convention labeling east   
      and west on lunar maps was reversed.   
      
                         Tomorrow's picture: light-weekend   
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