近年来,随着老师们对地球日照投影状况研究的不断深入,很多地理报刊与资料上刊载了不少日照状况的投影图,并往往配有大量习题。然而,由于投影方法的不同,同一习题依图解求得的答案不尽相同,这是因为将球面投影形成平面,肯定会造成变形的原因所致。但是,只要解题方法科学性强,投影方法选择恰当,这种矛盾是可以最大限度避免的。 (一)地球日照图的绘制有关地球日照状况的投影,中学教材中选用的是方位投影和园柱投影两类。如昼夜长短变化示意 In recent years, with the continuous deepening of teachers’ research on the projection of the sun’s sunshine, many geographical newspapers and magazines have published many projections of the state of sunshine and are often equipped with a large number of exercises. However, due to the difference in projection methods, the answers to the same problem in the diagram are not the same. This is due to the fact that the spherical projection is a flat surface and will definitely cause deformation. However, as long as the problem-solving method is scientific and the projection method is properly selected, this contradiction can be avoided as much as possible. (A) The drawing of the Earth’s sunshine map The projection of the sun’s sunshine conditions, and the use of azimuth projection and cylindrical projection in high school textbooks. Such as changes in the length of day and night