The Duration of Sunlight Recorder, (click here) also known as the Campbell-Stokes Recorder, The Stokes Sphere, or simply referred to as a Sunshine Recorder is used to concentrate sunlight into a beam hot enough to burn paper. It is one of the oldest methods for recording periods of sunlight throughout the day, and the device is relatively unchanged since it was invented in 1853. The resulting burn line in the paper (the line is created as Earth rotates) indicates periods of sunshine. Breaks in the line (no burn), indicate periods of cloud cover (during daylight hours). The paper onto which light is concentrated records only 12 hours worth of observations, as there is no need to record sunlight at night!...
I sometimes think people just don't get it, about greenhouse gases. I mean it is a gas right? So, let's start with the fact sunlight exists and it is powerful. It can burn paper. Burning means there is heat. In the absence of sunlight there is no heat or burning. Therefore, sunlight is a serious part of global warming.
