对于天文学家来说，平面的宇宙意味着几何学的一般原理将被遵守，光在直线中运行，而不是曲线。

To astronomers, flat means that the usual rules of geometry are observed - light travels in straight lines, not curves.

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首先，eccentric(偏心的)是一个天文学或几何学术语。人们将它与concentric(同心的)做比较，因为同心圆都只有一个圆心，而偏心圆则不是如此。

At first eccentric was an astronomical or geometrical term and was contrasted with concentric so that concentric circles Shared the same center while eccentric circles did not.

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通过对中国古代平面星图画法的研究，认为中国古代的天文学家在绘制星图时并未采用西方投影几何方法。

This paper think the Chinese ancient astronomer did not use the western projective in the course of drawing star map, on the contrany, they have their own personality methods.

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通过对中国古代平面星图画法的研究，认为中国古代的天文学家在绘制星图时并未采用西方投影几何方法。

This paper think the Chinese ancient astronomer did not use the western projective in the course of drawing star map, on the contrany, they have their own personality methods.

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