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太阳直射点的回归运动,是地球上形成四季的根本原因和划分五带的重要依据。如何使学生能够通过演示,来获得直观印象,帮助其真正理解呢?近年来我在教学中采用了地球仪与铁架台配合演示实验,效果良好。具体步骤如下: 一、取一化学实验用的铁架台放置于平面实验台(或宽平面课桌)中央,在其上固定由两根细长木棒(或铁丝)组成的十字架,并调放成与实验台面呈平行状态,以表示相互垂直的四个方向的太阳直射光线。二、取一架地球仪放置铁架台一侧,使其北极对准教室某一明显目标(墙角或灯具),以表示北极星方向。
The regressive movement of the sun’s direct point is the fundamental reason for the formation of the four seasons on the earth and an important basis for the division of the five bands. How to enable students to obtain visual impressions through demonstrations to help them really understand? In recent years, I have used globes and iron stands to demonstrate experiments with good results. The specific steps are as follows: 1. Take a metal stand for chemical experiments and place it on the center of a plane test bench (or wide flat desk). Fix a cross made of two slender wood rods (or iron wires) and put them on it. It is in a parallel state with the experimental tabletop to represent direct sun rays in four directions perpendicular to each other. 2. Take a globe and place it on the side of the iron platform so that the north pole is aligned with a distinct target (corner corner or lamp) in the classroom to indicate the direction of the Polaris.