[题目]阅读有关图表.回答下列问题.(1)地球自转是围绕在转动.周期约天.上图示意的是北半球节气中的日.太阳光直射在 .南寒带出现现象.表1:夏至日我国三城市日出日落时刻表地点经度纬度日出时刻日落时刻乌鲁木齐87.6°E43.8°N06:2721:55北京116.4°E39.9°N04:4619:47泉州118.6°E24.9°N05:1718:59(2)北京与乌鲁木齐纬度� 题目和参考答案——青夏教育精英家教网—

【题目】阅读有关图表，回答下列问题。

（1）地球自转是围绕在转动，周期约天。上图示意的是北半球节气中的日，太阳光直射在（重要纬线），南寒带出现现象。

表1：夏至日我国三城市日出日落时刻表（北京时间）

地点	经度	纬度	日出时刻	日落时刻
乌鲁木齐	87.6°E	43.8°N	06:27	21:55
北京	116.4°E	39.9°N	04:46	19:47
泉州	118.6°E	24.9°N	05:17	18:59

（2）北京与乌鲁木齐纬度相近，但日出时刻比乌鲁木齐较早，主要原因是。

（3）北京的白昼时间比泉州更（长或短）。（提示：昼长＝日落时刻-日出时刻）。

（4）夏至日后，泉州的白昼时间将变（长或短），日落时间将（推迟或提早）。

【答案】

（1）地轴 1 夏至北回归线或23.5°N 极夜

（2）地球自西向东自转，北京位于乌鲁木齐东面

（3）长

（4）短提早

【解析】

试题分析：

（1）地球自始至终的围绕地轴自西向东运动，其自转一周的时间为1天。地球在公转时，由于黄赤交角和地轴空间指向不变，使得一年内太阳光线的直射点有规律地在南北回归线之间移动。据图可知：上图示意的是太阳光直射在北回归线或23.5°N，为北半球夏至日，此时，南寒带出现极夜现象。

（2）由于地球的自西向东自转，地球上同纬度地区位置偏东的地方，要比位置偏西的地区先看到日出，这样不同经度的地方就产生了时间差异，而北京位于乌鲁木齐东面，这就是造成北京与乌鲁木齐纬度相近，但日出时刻比乌鲁木齐较早的主要原因。

（3）据表格结合 “昼长＝日落时刻-日出时刻”公式可知：北京的昼长为15:01，泉州的昼长为13:42，因此北京的白昼时间比泉州更长。

（4）夏至日以后，太阳直射点逐渐向南移动，随着太阳直射点的南移，泉州的白昼时间将变短，日落时间将提早。

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