问题 选择题

关于图3说法正确的是 

A.目前的黄赤交角约是66.5°

B.图中角α是黄赤交角

C.黄赤交角始终不变

D.黄赤交角度数即是南北回归线的度数

答案

答案:D

题目分析:由于地轴与黄道面成66°34'夹角,故黄赤交角为23°26',A错误;图示角α是地轴与黄道面的夹角,B错误;由于地轴的倾斜角度不变,故黄赤交角的度数始终不变,C错误。黄赤交角的度数决定太阳直射点的移动范围,即决定南北回归线的度数,D正确。

点评:本题难度低,解题的关键是能结合图示判断地轴与黄道面的交角与黄赤交角的差异,掌握黄赤交角的度数和对太阳直射点移动的影响。本题还可考查黄赤交角度数的变化对五带的影响。

阅读理解

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