先请大家思考一个问题:如果你静坐在赤道上的屋子里,那么在一天里你运动的距离是多远呢?通过物理的学习我们知道,研究物体的运动需要确定参照系.如果选取的是地面为参照系,那么在我们一天里你都没有运动;但如果选取地球之外的一点来观察这一天的运动,就恰好是绕着地球南北轴心球绕一周,我们在一天里走了赤道的长度. First, ask everyone to think about a question: If you sit quietly in a house on the equator, how far is your distance in one day? Through physics learning, we know that studying the motion of objects requires the determination of a reference frame. If you choose The ground is the frame of reference, then you have no movement in our day; but if you choose a point beyond the earth to observe the movement of this day, it happens to be around the axis of the Earth’s north-south axis, we walked the equator in one day. length.