horizon; where sky meets earth
Literary or poetic term for the distant line where the sky and the earth appear to meet. Not an everyday word; 地平線 (ちへいせん) is the common modern equivalent.
The sunset sinking into the horizon is beautiful.
In the poem, he described the horizon as 'the meeting point of heaven and earth'.
Compound of 空 (くう, 'sky') and 際 (さい, 'edge' or 'boundary'). The exact historical derivation is uncertain, but the word is formed from classical Chinese-derived elements.