Lanzhou Gradient

Quick answer：

Lanzhou Gradient refers to the unique color gradient seen in the skyline of Lanzhou, a city in northwestern China. This visual effect is often captured in photographs and is a popular topic among tourists and photographers. The gradient is typically described as transitioning from the darker blues of the Yellow River to the brighter oranges and reds of the city's buildings and sky. The phenomenon is due to the geographical and atmospheric conditions in the region.