16点阵的大屏幕显示器的C语言程序。程序清楚，可读，叙述清楚，调试通过。-The big screen display of dot matrix C language program. Program is clearness.

计算晴空指数，即入射到水平面的太阳总辐射量与天文辐射之比。(Calculate clear sky index.That is, the ratio of the total solar radiation incident on the horizontal plane to the astronomical radiation.)