Normal circulation refers to the regular flow or movement of something, typically in a consistent and predictable manner. In the context of weather, normal circulation refers to the typical patterns of air movement that occur due to the Earth's rotation and other atmospheric factors. This can include trade winds, westerlies, and polar easterly winds, which help regulate global climate patterns by redistributing heat from the equator towards the poles and cold from the poles towards the equator. In a broader sense, normal circulation can also refer to the standard or typical flow of goods, services, information, or people within an economy, society, or system.