“Firmament” in Japanese
Short answer
Firmament in Japanese is “一天” (itten). Full meaning: the whole sky, firmament.
Other ways to say “Firmament” in Japanese
天空
tenkuu sky, air, ether, firmament, the heavens
霄漢
shoukan sky, heavens, firmament
大空
oozora wide open sky, the blue, heavens, firmament
おおぞら
oozora wide open sky, the blue, heavens, firmament
てんくう
tenkuu sky, air, ether, firmament, the heavens
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