此工程坐标反算方位角，方便用于测量工程使用。-Inverse azimuth coordinate this project, easy to use for measuring project.

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