astronomical

astronomical /ˌæstrəˈnɑːmɪkəl/ adjective
also astronomic /ˌæstrəˈnɑːmɪk/
astronomical
/ˌæstrəˈnɑːmɪkəl/
adjective
also astronomic /ˌæstrəˈnɑːmɪk/
Britannica Dictionary definition of ASTRONOMICAL
1 
: of or relating to astronomy
2 
: extremely large

— astronomically

/ˌæstrəˈnɑːmɪkli/ adverb