firmament
noun
                                                                                                                            
                                                            fir·ma·ment
                    
                                                                                                              
                                                                                                                                  ˈfər-mə-mənt  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : the vault or arch of the sky : heavens                                      
              
                             
Stars twinkled in the firmament.
                         
                
                    2
                    
                                obsolete 
                                  
              
          
                                                      : basis                                      
                
                    
3
                    
                                          
              
          
                                                      : the field or sphere of an interest or activity                                      
              
                             
the international fashion firmament
                                       She's a rising star in the city's artistic firmament.
                         
                
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  Merriam-Webster unabridged




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