From the solar radiation... At TOA Earth zenith Sun Kpic ol Cancer 5R10r 作r21 Z ropic of Capricorm c0t.21 Tropic of Cancer Equtor SW=S(dm/d)2 cosZ 少 d--earth-sun distance T环R[are June 27 dm--mean earth-sun distance Z--zenith angle Solar radiation varies with latitude and season 授课教师：张洋7n At TOA 授课教师：张洋 7 From the solar radiation... Solar radiation varies with latitude and season SW = S (dm/d) 2 cosZ d -- earth-sun distance dm -- mean earth-sun distance Z -- zenith angle zenith Z