Where does “四天” come from?

四天 (Japanese) comes from Japanese 四, from Middle Chinese 四, from Proto-Sino-Tibetan *pV-lij — four.

四天 (Japanese): the four different states of the sky corresponding to the four seasons

Definitions

  1. the four different states of the sky corresponding to the four seasons

Ancestry of “四天”, step by step

四天 traces back through two separate lines of ancestry.

via Japanese 四

StepLanguageWordMeaning
1Japanese四four, 4; the fourth
2Middle Chinese四—
3Proto-Sino-Tibetan*pV-lijfour

via Japanese 天

StepLanguageWordMeaning
1Japanese天the sky, the heavens; the area above a kitchen...
2Old Japanese天sky, heavens
3Proto-Japonic*amay—
Every word from Proto-Sino-Tibetan *pV-lij →Every word from Middle Chinese 四 →Every word from Japanese 四 →