| 释义 |
apsis/ˈæpsis/n. (pl. apsides /-di:z/) either of two points on the orbit of a planet or satellite that are nearest to or furthest from the body round which it moves 拱点，近(远)日点(行星或卫星轨道上离引力中心最近或最远的一点) □ apsidal adj.[Latin, from Greek (h)apsis, -idos ‘arch, vault’] |