太阳视运动

1

配合太阳视运动轨迹，用图解法或数值计算法即可求出相应点的实际日出、日落时间和可照时数。

Therefore , it is possible to obtain the sunrise time and the day length of any point in the shading region graphically or numerically , with the apparent motion locus of the sun and the above calculation of the corresponding point .
2

事实上，我国早在汉代就发现了引起太阳周年视运动不均匀的两个原因。

In fact , two sources causing the non-uniformity were discovered as early as in Han Dynasty .
3

运用球面三角知识量化太阳周日视运动规律

Exercise . The application of spherical surface triangle on the quantization of sun circle daily turn around