日心距 meaning in Chinese

central meridian distance

The 29 f globular clusters in the galaxy are selected as samples in my paper ( the space distribution and motional orbits of the samples have not been researched in detail before . ) . according to the basic parameters : azimuth coordinates , distances from the sun , radial velocities and proper motions of sample clusters , the initial positions and velocities of the samples are reduced using the galactic coordinates , and their orbits are integrated by numerical method for three different galactic gravitational potential models
本文选用银河系中29个累积光谱型为f型的球状星团作为样本(这些样本星团的空间分布和运动特征都没有被详细地讨论过) ，根据它们的基本资料：方位坐标、日心距、视向速度，绝对自行等参数，归算处理得出了各样本星团的空间分布和运动速度。