本文利用极坐标下斯涅尔定律，系统地讨论了电离层折射对赤经赤纬的修正问题，并据此给出了射线描迹法。

Using the Snell's law in polar coordinates, the ionospheric refraction effects on the declination and right ascension determination is discussed in this paper.

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塑料的曝晒测试方法翀–直接曝晒老化，经玻璃过滤的日光的间接老化，和经菲涅耳镜子反射聚集日光的加速老化。

Plasticss – Methods of Exposure to Direct Weathering, Indirect Weathering Using Glass filtered Daylight, and to Intensified Weathering by Daylight Using Fresnel Mirrors.

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塑料的曝晒测试方法翀–直接曝晒老化，经玻璃过滤的日光的间接老化，和经菲涅耳镜子反射聚集日光的加速老化。

Plasticss – Methods of Exposure to Direct Weathering, Indirect Weathering Using Glass filtered Daylight, and to Intensified Weathering by Daylight Using Fresnel Mirrors.

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