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太阳周日视运动与生活实际联系紧密,利用周日视运动图可以分析太阳的升落方向或据视运动方向确定地平东南西北方向,还可以考查太阳高度角和经纬度计算等相关知识。在教学中,笔者通过特殊的视运动试题分析、讲解及变式练习,学生受益匪浅,达到了举一反三的效果。[例1]图1是北半球某地观测到的太阳周日视运动图,求太阳直射点的纬度和该地的纬度。解析:读图可知,太阳该日视运动与春秋二分观测到的视运动相比偏南20°,所以该图实际上是指太阳直射20°S时在该地绘制的周日视运动图;该日正午太阳高度H=40°,据公式H=90°-β,(β是指该地与太阳直射点相隔的纬度数)β=50°。又因为太阳直射20°S,所以,观测者所在地理纬度是30°N
Sunday sun exercise and life is closely linked to the daily use of Sunday optometry can analyze the direction of the sun’s rise or fall depending on the direction of movement to determine the level of southeast northwest, you can also check the solar elevation angle and latitude and longitude calculation and other related knowledge. In teaching, the author through a special visual acuity test analysis, explanation and variant exercises, students benefit greatly, reaching the effect of giving top priority to others. [Example 1] Fig. 1 is a day-of-the-sun day-of-the-field observational image observed in a place in the northern hemisphere, seeking the latitude of the direct sun and the latitude of the place. Analysis: read the figure shows that the Japanese sun movement and the spring and autumn dichotomous observed movement compared to the south 20 ° south, so the map actually refers to the sun at 20 ° S in the sun when drawn as the daily visual map; The sun’s height at midday is H = 40 °. According to the formula H = 90 ° -β, (β means the latitude between the sun and the direct point) β = 50 °. And because the sun is direct at 20 ° S, the geographic latitude of the observer is 30 ° N