日照仪应用实例探析

Exploration on Application Example of Sunshine Meter

日照仪是模拟计算机又是科普仪器。操作日照仪发现一年中北回归线日照最强节气太阳高度角高于赤道日照最强节气对应时刻的太阳高度角。在日照仪上找到原因,使用公式计算太阳高度角,证出两地各自日照最强半年北回归线太阳高度角高于赤道对应时刻的太阳高度角,只有这两个半年开始的一天和结束的一天及正中间一天的日中时刻两地的太阳高度角相等是例外。

The sunshine meter is both an analog computer and a popular science instrument.The operation of the sunshine meter shows that the solar elevation angle of the Tropic of Cancer solar term is higher than that of the equatorial at the corresponding time of the strongest solar term in a year.The causes are found out on the sunshine meter.The formula is used to calculate the solar elevation angle.It is proved that the solar elevation angle of the Tropic of Cancer is higher than that of the equator at the corresponding time of the equator with the strongest sunshine for half a year,except that the solar elevation angles of the two places are equal at the beginning and end of the day and the mid-day in the middle of the day.