Synonyms of firmament in English:

firmament

noun

(the firmament) • literary
  • the sky, heaven, the blue, the wide blue yonder, the azure, the heavens, the skies
    literary the vault (of heaven), the celestial sphere, the empyrean, the welkin

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space