Details – If the sun was hot, then just as we feel the heat here (at ground level), as we rise higher to 10,000 feet or 25,000 feet then we should feel more and more heat. But what happens when we rise higher? On a hill station, even on a summer day, cold winds blow, that’s because as we rise higher and higher it gets colder and colder. So that means the sun really doesn’t emit any heat. In reality, when the sun’s rays touch the surface of the Earth, heat is generated. Doesn’t that sound incredible?