[Ref ISBN 978-1-61854-262-5]
Insulation, “日照” in Chinese, usually refers to the situation that the earth’s surface receives solar radiation.
In daytime, peak insolation occurs around 1200LT, but maximum surface air temperature usually occurs during the mid-afternoon; At night, insulation is absent. Therefore, sun’s rays is the major reason causes uneven heating on the earth’s surface.
Rightly, Sun’s rays as well as uneven heating on the earths’ surface is the main cause of all WX!