The word 天亮 is formed by directly combining two concepts: 天 (tiān), meaning "sky" or "heaven", and 亮 (liàng), meaning "bright" or "to become light". It visually depicts the natural phenomenon of dawn, where the dark sky gradually becomes illuminated. The formation is a straightforward, almost pictorial merging of these core ideas to capture the specific moment when night ends and the sky brightens with the coming of daylight.