What is another word for vault of heaven?
Pronunciation: [vˈɒlt ɒv hˈɛvən] (IPA) 
The phrase "vault of heaven" is used to describe the sky or the celestial sphere. There are several synonyms for this phrase in English that can be used to add variety to one's writing or speech. One common synonym is "firmament," which refers to the expanse of the heavens. Another option is "celestial dome," which emphasizes the idea of a round, overarching structure. "Heavens" or "sky" are also simple but effective alternatives. More poetic synonyms include "azure canopy," "starry veil," or "canopy of stars." Regardless of the choice, all of these synonyms convey a sense of awe and wonder at the vastness and beauty of the cosmos.
