划圆是通过直径片的端点沿圆周轨迹转动，其圆心的位置是固定的原理而实现的。
The end of diameter plate moves along the circumference trace and its circle center is fixed.
截面最小二乘圆心在绝对坐标系内的位置是影响圆柱度形状误差大小的重要因素。
The position of the least square center for a cross section in the absolute coordinate system is an important factor that affects cylindrical form errors.
这些弯曲的星迹有一个明显的圆心，这就是南天极，它位于画面左上方边缘外一点点的位置上。
At the apparent center of the curving trails, the South Celestial Pole lies just off the upper left edge.
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