[题目]海南中学高一某研究性课题小组测量获得我校正午太阳高度为70°.据此完下列问题.[1]其测量日期可能是A. 3月21日 B. 6月22日 C. 9月23日 D. 12月22日[2]课题小组测量时间大约是北京时间A. 11时20分 B. 12时 C. 12时24分 D. 12时40分题目和参考答案——青夏教育精英家教网—

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【题目】海南中学(110°E,20°N)高一某研究性课题小组测量获得我校正午太阳高度为70°。据此完下列问题。

【1】其测量日期可能是

A. 3月21日 B. 6月22日 C. 9月23日 D. 12月22日

【2】课题小组测量时间大约是北京时间

A. 11时20分 B. 12时 C. 12时24分 D. 12时40分

【答案】

【1】C

【2】D

【解析】试题分析：

【1】海南中学的纬度是20°N，正午太阳高度是70°，根据正午太阳高度角公式，可以计算出直射点位于赤道，其测量日期可能是3月21日或9月23日。结合题目中信息，数据是第一学期高一学生的课题小组活动测量。高一入学时间在暑假后，日期可能是9月23日，C对。A、B、D错。

【2】课题小组测量时间是当地地方时正午12点，即110°E经线是正午12点。经度每差1°，时间相差4分钟，东边的比西边的早，该地比北京时间晚40分钟，可以计算出北京时间大约是12时40分，D对。A、B、C错。

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