地球公转的地理意义导学案2.pdf
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1、可编辑 word,供参考版!富宁一中高中(地理)必修一导学案课题第一单元第三节地球公转的地理意义共 4 课时课型新授课备课教师:曾凡波(主备)沈世旭农德良黄汉理谭志杰知识目标:1、地球公转的轨道方向、速度和周期2、黄赤交角及其地理意义3、正午太阳高度的变化4、昼夜长短的变化5、四季与五带重点难点:1、日地距离和公转速度的变化2、黄赤交角的形成及其对太阳直射点移动成因3、昼夜长短的变化随纬度和季节变化的规律4、正午太阳高度随纬度和季节的变化规律知识要点:学习引导一、地球公转的运动规律从北极上空俯视_方向旋转1.地球公转的方向:自_向_。从南极上空俯视_方向旋转2.地球公转的周期:_天 _时_分_
2、秒,一个恒星年。一月初,_日点,地球公转速度_ 3.地球公转的速度:一月初,_日点,地球公转速度_ 二、黄赤交角(1)阅读 P15 教材相关内容及图1-3-3 黄赤交角图。黄道平面是地球的轨道平面,赤道平面是通过地心与地轴垂直的轨道平面,赤道平面与黄道平面的夹角简称。可编辑 word,供参考版!【动手画一画】在右图中标出赤道平面和黄道平面,并用表示黄赤交角并标明度数。(2)阅读阅读P15 教材相关内容及图1-3-4 二分二至地球的位置。随着地球在公转轨道位置的变化,地表接受太阳垂直照射的点(简称)就会改变,引起太阳直射点在南北回归线之间往返移动。太阳直射点在赤道南北的这种周期性往返运动,称为,
3、运动周期为,又叫。节气时间太阳直射点运动趋势春分夏至秋分冬至【活动探究】见教材P16.【举一反三】如果没有黄赤交角,太阳直射点是怎样移动的?如果黄赤交角增大为30,太阳直射点的范围有何变化?三太阳高度的变化1、太阳高度是太阳光线与之间的夹角,一天中太阳高度最大值出现在,称为正午太阳高度。2、正午太阳高度的变化规律(1)纬度变化规律:(2)季节变化规律:夏至日:冬至日:春分日秋分日:【合作讨论】读同一时刻不同纬度正午太阳高度示意图和北半球某地不同日期正午太阳高度的变化示意图,归纳总结正午太阳高度的变化规律。3、正午太阳高度的应用【观察活动】观察一天中大树日影长度和方向的变化。【活动探究1】利用正
4、午太阳高度确定楼距楼高,见教材开始的活动【活动探究2】太阳能热水器的倾角调整:9 月 23 日,洛阳的正午太阳高度为35,怎样调节支架使热水器才能有最好的的效果?四昼夜长短的变化(1)思考:引起昼夜长短的变化的原因?(2)昼夜长短的纬度变化阅读课本昼夜长短的变化规律回答:A.春分日至秋分日(北半球夏半年),北半球昼夜长短的纬度变化特点。B.秋分日至次年春分日(北半球冬半年),南半球昼夜长短的纬度变化特点。文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5
5、D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 H
6、J2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4
7、P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10
8、 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5
9、K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3
10、文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:C
11、W9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3可编辑 word,供参考版!C.春秋分日,全球各地昼夜等长,都是12 小时。规律总结:思考:A.太阳直射点所在半球,昼夜长短有何特点?(递增规律)B.南北半球同纬度,昼夜长短有何特点?(对称规律)C.昼夜长短的变化幅度与纬度有何关系?(变幅规律)(3)昼夜长短的季节变化规律阅读右图回答:说出自春分日至次年春分日北半球昼夜长短的变化特点。规律总结:结合右图思考
12、:太阳直射点的移动方向与昼夜长短变化有何关系?(4)极昼、极夜规律北半球夏半年极昼变化情况(以北半球为例说明)春分日全球昼夜平分,春分过后,随着太阳直射点的北移,极昼从向南扩大,夏至日全部极昼,夏至日过后随着太阳直射点的南移,极昼范围从向北缩小,到秋分日全球昼夜平分。北半球冬半年极夜变化情况(以北半球为例说明)秋 分 日 过后,随 着 太阳直射 点 的继 续南 移,极夜从向 南扩 大,冬 至日全部极夜,冬至日过后随着太阳直射点北移,极夜范围从向北缩小,到春分日全球昼夜平分。(5)太阳直射点与昼夜长短的关系:太阳直射点所在的半球(该半球为夏半年)_,纬度越高,白昼_;另一半球(冬半年)_,纬度越
13、高,白昼则_。直射点的纬度越高,地球上各地昼夜长短相差_,出现极昼极夜的范围_。太阳直射北回归线时,北半球各地昼_,夜 _,北极圈内出现_;而南半球则昼_,夜 _,南极圈内出现_。太阳直射南回归线时则相反。赤道上全年 _,春、秋分日全球_。五昼夜长短的时间计算(1)根据昼弧或夜弧的长度进行计算昼(夜)长时数昼(夜)弧度数/15(举例(2)根据日出或日落时间进行计算(举例文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10
14、 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5
15、K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3
16、文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:C
17、W9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5
18、D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 HJ2B8J4P10V10 ZG1N5K1O5U3文档编码:CW9L5J5D9Y6 H
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