太阳直射点南北移动,引起正午太阳高度的变化。计算一地正午太阳高度的大小,用公式H=90°-(?)+δ。关于这个公式的推导,教材及教参都没有系统的介绍,难免使教师、特别是没有受过专业培训的教师在教学时照本宣科,学生也难以理解,靠死记硬背。某地正午太阳高度大小的计算公式推导如下: 设某时太阳直射点在A,它的纬度为δ,某地B的纬度为(?)。作图如下 The sun’s direct point moves north and south, causing a change in the height of the sun at noon. Calculate the size of the solar height at midday, using the formula H=90°-(?)+δ. With regard to the derivation of this formula, there is no systematic introduction of teaching materials and teaching aids. It is inevitable that teachers, especially those who have not received professional training, will be enrolled in the teaching class when they teach, and students will find it difficult to understand and rely on rote learning. The calculation formula for the height of the sun at a certain place is deduced as follows: Let the sun be directly at A, its latitude be δ, and the B of a certain place is (?). Drawing is as follows