insolation duration

基本解釋

That is to say, everyday the insolation-duration on slope decreases or it is invariable when the grade of slope increases.
在任意時段（如月、季、年等）內(nèi)，坡面的可照時間也總是隨坡度的增加而減少或保持不變。
According to the formula to calculate the everyday insolation-duration, it is possible that the everyday insolation-duration on slope is equal to zero.
根據(jù)坡面日出日沒時角配置關(guān)系及其變化規(guī)律，坡面的可照時間可根據(jù)不同的情況用一組具體的計算公式表示。
Due to local terrain factors such as slope, aspect and terrain inter-shielding, the insolation duration over rugged terrain is different from over horizontal surface.
由于坡度、坡向和地形之間相互遮蔽等局地地形因子的影響，實際起伏地形下的日照時間與水平面上的日照時間有一定差異。