n.八分圆；八分仪；离角45度的位置
Keywords octant;circle interpolation;deviation; 卦限;圆弧插补;偏差;
an instrument for measuring the angular distance between celestial objects; resembles an octant 测量两个天体之间的角距离；类似于八分仪
an instrument for measuring the angular distance between celestial objects; resembles an octant. 测量两个天体之间的角距离；类似于八分仪。
