说明：  计算太阳辐射的程序：(1)计算太阳在水平面上的瞬时辐照度和平均辐照度；(2)计算太阳在倾斜面上的瞬时辐照度和平均辐照度；(
(The program of calculating solar radiation: (1) calculating the instantaneous irradiance and average irradiance of the sun on the horizontal plane; (2) calculating the instantaneous irradiance and the average irradiance of the sun on the inclined plane;)