Use the word empyrean when you're talking about the heavens or the sky. You might describe the empyrean curve of the night sky, scattered with stars, particularly if you wanted to sound poetic.

The adjective empyrean, pronounced "em-PEER-ee-an," can describe a religious idea of heaven. It can also describe the sky itself, or something that is awe-inspiring, like the empyrean beauty of the Himalayas. The phrase the empyrean means "the heavens" or "the sky," or in Greek cosmology, the highest, fiery sphere of heaven, empyros in Greek, and the root of empyrean.

Definitions of empyrean
  1. adjective
    of or relating to the sky or heavens
    “the empyrean sphere”
    synonyms: empyreal
  2. noun
    the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
    synonyms: celestial sphere, firmament, heavens, sphere, vault of heaven, welkin
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    type of:
    the extended two-dimensional outer boundary of a three-dimensional object
  3. adjective
    inspiring awe
    “" empyrean aplomb"- Hamilton Basso”
    synonyms: empyreal, sublime
    having or deserving or conferring glory
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