Moon orbiting Earth, tidally locked so showing one face to Earth:


    1      2      3      4

                         m
                         v
 m> E      E      E <m   E
           ^
           m 


Seen from Moon point of view:
                        
            E              
            ^                 
     m> E   m   E <m      m
                          v
                          E


Moon is rotating:
                        
            ^                 
     m>     m     <m      m
                          v