系统直接计算出任意一点在给定时刻的太阳高度角、太阳方位角、太阳赤纬角、当天日照时间、全年日照时间以及年平均日照时间等。
System directly calculate any point at a given moment in the sun elevation Angle, solar azimuth, solar declination Angle, the day of sunshine, year round sunshine and average annual sunshine time.
这是逐渐临近冬至的一段时间，太阳的赤纬也是不断地缩小。
At that time of year the winter solstice was coming, and the Sun was moving into a lower declination in the sky.
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