ZetaTalk(齐塔人之声)认为X行星(Planet X)会引起地球极移，并给出了X行星在2001年6月时的天文坐标(astronomical coordinate)
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astronomical coordinate system [天] 天文坐标系
astronomical coordinate measuring instrument 天文坐标测量仪
methods of astronomical coordinate 天球坐标方法
astronomical E coordinate 天文坐标
Especially, It can rapid by provide a precise reference coordinate system for the astronomical orientation of various space vehicles at real time.
特别是对于各种空间飞行器的天文实时定位能提供一个精确而快速的参考坐标系统。
In this article, the method is described for measuring the scales of the two coordinate axes of a CCD plate through astronomical observations and the nonperpendicularity of the axes.
本文叙述了用天文观测测定CCD片子上两坐标各自比例尺和两坐标轴不垂直度的方法；
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