同时也为研究古代天文、历法提供了准确的参考尺度。

Their accuracy is amazing and they also provide precious materials for research on the development of science and technology in ancient China.

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然后，应用最优控制理论得出慢时间尺度上的解，并将其作为降维后的最优参考轨迹；

Then, through solving the slow time-scale problem by optimal control theory, the optimal reduced-order reference trajectory is obtained.

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该方法对类似的并联机构的尺度综合具有较高的参考价值。

This approach provides a high reference value for dimension synthesis of the other parallel kinematic mechanism similar to it.

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