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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 October 21   
      
                                   Quarter Moons   
                  Image Credit & Copyright: Marcella Giulia Pace   
      
      Explanation: Half way between New Moon and Full Moon is the Moon's   
      first quarter phase. That's a quarter of the way around its moonthly   
      orbit. At the first quarter phase, half the Moon's visible side is   
      illuminated by sunlight. For the Moon's third quarter phase, half way   
      between Full Moon and New Moon, sunlight illuminates the other half of   
      the visible lunar disk. At both first and third quarter phases, the   
      terminator, or shadow line separating the lunar night and day, runs   
      down the middle. Near the terminator, long shadows bring lunar craters   
      and mountains in to sharp relief, making the quarter phases a good time   
      to observe the Moon. But in case you missed some, all the quarter   
      phases of the Moon and their calendar dates during 2022 can be found in   
      this well-planned array of telephoto images. Of course, you can observe   
      a first quarter Moon tonight.   
      
                       International: Observe the Moon Night   
                    Tomorrow's picture: ghostly northern lights   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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