The Gradual Color of the Sky

Quick answer：

The 'Gradual Color of the Sky' refers to the change in color that occurs in the sky, typically during sunrise or sunset. This phenomenon is caused by the scattering of sunlight by molecules and particles in the Earth's atmosphere, which results in different colors being visible at different times of day. The most famous gradient colors are those seen during sunset, which can range from warm hues like red and orange to cooler colors like purple and blue.