给定经纬度和高程和时间，计算该时刻下，太阳的方位角和俯仰角，精度高-Given the latitude and longitude and elevation, and time to calculate the moment, the sun' s azimuth and elevation, high precision

BP神经网络用于配电网线损计算，有较高计算精度-BP neural network for the distribution network line loss calculation, a higher accuracy