At that time of year the winter solstice was coming, and the Sun was moving into a lower declination in the sky.

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。

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Now you can get the declination of the sun with the next formula.

现在，你就可以得到衰落的太阳与未来的公式。

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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.

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。

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