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日照时数是指太阳每天在垂直于其光线的平面上的辐射强度超过或等于120W/m2的时间长度。
The sol来自ar duration is the length of tim丝台重混因照鲜时e in which the solar radiation falling on a 360百科plane perpendicular to the direction 称封难吃of the sun is greater or equal to 120W/m2.
再给出一个世界气象组织(World Meteorological Organization)的标准定义:Accordi越通比肥ng to WMO (2003), sunshine dur团为判聚但雨ation during a given period 国印愿也场战绍轮is defined as the sum of that sub-period for which the direct solar irradiance exceeds 120 W m–获一冷作灯企2.