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  1.                 From German - English Ding/FreeDict dictionary ver. 1.9-fd1:
                

    
                
                  
    sideral /zˌiːdeːrˈɑːl/ <adj>
sidereal <adj>, of the star <adj>
         Note: s
   Synonyms: siderisch, Stern …
    

     see: siderische Rotationsperiode