The microchip over here records the exact angular position every  thousandth of a second and compares it with the previous position.

这里的微芯片每千分之一秒记录一次精确的角度位置，并将其与之前的位置进行比较。

For now, you learned about the qualities of rotational motion, including angular position, angular velocity, periodic motion, and the special case of rolling without slipping.

现在，您了解了旋转运动的性质，包括角位置、角速度、周期运动，以及滚动不打滑的特殊情况。

First, the incremental optical encoder from earlier can't read out an absolute angular  position because the wheel has 48 equally spaced spokes, and it can't discern one angle from the  next.

首先， 早期的增量式光学编码器无法读出绝对角度位置， 因为车轮有 48 个等距辐条，并且无法区分一个角度和下一个角度。