基于影子坐标，计算该地点的经纬度。最后利用最小二乘法拟合得到结果。由于建立模型时把问题简单化，因此最后结果会有一定误差-Shadow Based on the coordinates, longitude and latitude of the location. Finally, the results obtained by least squares. Since the establishment of model simplification of the problem, so th