The word 秋天 is formed by combining two characters: 秋, which pictorially and conceptually represents the autumn season (often associated with the ripening and harvesting of grain), and 天, meaning "sky" or "heaven". Together, they create a compound that conceptually fuses the specific season with the overarching dome of the sky, evoking the characteristic atmosphere, the changing heavens, and the essential feeling of the autumnal period as a distinct time of the year.