这个程序是通过opengl实现模拟太阳、月亮、地球的在三维空间中进行旋转，还加了些纹理，对了解opengl坐标变换、全局坐标、局部坐标的设置有很多帮助。-This program is in three-dimensional space through opengl analog sun, the moon, the earth rotates, also added some texture understanding opengl coordinate transformation, gl