1.八分圆;八分区;卦限;八分仪;【植】八分体
2.【天】相对两天体成四十五度的位置
1.the position of one body in the sky one-eighth of a circle (45°) from another
2.one-eighth of a circle, with or without the enclosed area
3.any one of the eight regions into which space is pided by the three planes of the Cartesian coordinate system