地球运动的地理意义始终是地理教学的重点和难点,其中,正午太阳高度不仅容易与“太阳直射”、“太阳高度”等概念相混淆,而且,其时空变化也是引起地球上昼夜长短变化和形成四季、五带的基础和前提。一、“正午太阳高度”与“太阳高度”、“太阳直射”概念的区别和联系太阳高度指入射光线与观测者所在地平面的夹角;太阳光线与地平面夹角为90°时,称为太阳直射;一日内最大的太阳高度才称为正午太阳高度。由以上概念可以看出,随地球自转,一年之中,太阳依次直射南北回归线及其间某条纬线上所有的点,但在某一时刻,则只直射其中一点,此时太阳位于直射点所在经线的上中天,被太阳直射的该条经线上各地太阳高度都被称为正午太阳高度。而太阳高度则以太阳直射点为中心向四周降低,呈同心圆状分布,到晨昏线 Geographical significance of the Earth’s movement is always the focus and difficulty of geography teaching, in which the midday sun height is not only confused with the concept of “direct sun”, “solar altitude”, etc., but also its temporal and spatial changes caused by day and night Length and change and the formation of four seasons, five with the foundation and premise. First, the “noon sun height” and “solar heights”, “direct sun ” the concept of difference and contact The sun height refers to the angle between the incident light and the observer’s plane; the angle between the sun’s rays and the ground plane is 90 °, called the direct sun; the maximum sun height within a day is called the midday sun height. From the above concepts, we can see that with the rotation of the Earth, in one year, the sun directly touches all the points on the Tropic of Cancer and its latitude lines at one time, but at some point, it directly shoots only one point, at which point the sun is located at the direct point Meridian of the meridian, the sun is the direct sunlight on the warp all around the height of the sky are known as midday sun altitude. While the sun’s height is the direct point of the sun as the center to lower around the week was concentric distribution, to the dusk line