Since the rotational axis of the Earth is tilted from the revolution axis by 23.5, the Sun, for example, rises at different directions at different times during the year.

• 由于地球的自转轴相对于公转轨道平面倾斜了23.；5度；再加上地球的绕日运动；所以太阳东升的方位角会随日子改变。