expression, noun
highest heavens; ninth heaven
A literary and archaic expression referring to the highest realm of heaven in classical Chinese and Japanese cosmology. Rare in modern Japanese outside of poetic or historical contexts.
九重の天に昇るような心地がした。
I felt as if I were ascending to the highest heavens.
From classical Chinese cosmology, where the heavens were conceived as having nine layers. The expression is preserved in Japanese literature and religious texts.