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日影变化与应用问题是学生学习的一个难点,下面就日影变化与应用谈点自己的教学看法,供各位同行参考。一、日影变化(一)日影的长短变化一天中,日影长短与当日太阳高度变化有关。1.极昼范围外,日出、日落时,太阳高度为零,太阳光线与地平面平行,日影最长,趋向于无限长;正午时,太阳高度达一天中最大值,日影最短。
Changes and application of the Japanese shadow is a difficult problem for students to learn, the following changes and application of the Japanese talk about their own teaching views for your colleagues reference. First, changes in Japanese shadow (a) changes in the length of the Japanese shadow One day, the length of the Japanese sun and the height of the day changes. 1. Outside the polar day, at sunrise and sunset, the sun is at zero height. The sun’s rays are parallel to the ground plane, and the longest shadows tend to infinity. At noon, the sun reaches the maximum in one day and the shadows in the shortest.