对那些早起的人们来说，金星处于月牙形的相是最适宜双目望远镜和小型望远镜观察的。
For early morning risers, its brilliant crescent phase was best appreciated with binoculars or a small telescope.
目前，在11月的黎明天空中，你都可以轻易通过双目望远镜看到金星月牙形的相。
For now, the crescent phase of Venus remains easy to enjoy with binoculars in November's dawn skies.
大口径望远镜主镜的面形精度是影响望远镜成像质量的关键因素之一。
The surface figure precision of the primary mirror in a large aperture telescope is a key factor influencing the imaging quality.
如何确定镜子的最佳支撑方式，来保证最优的镜面面形精度，这在天文望远镜的光学成像系统中具有重要的意义。
How to design the best support of the mirror to ensure the highest accuracy of the mirror surface, which is very significant for the optical and image system of the astronomical telescope.
望远镜主镜面形误差的指标制定、分析以及评价方法对主镜加工具有重要的指导意义。
The methods of specification, analysis and evaluation on telescope primary mirror figure error have an important instructive meaning to mirror fabrication.
提出了一种十字形光束扫描方法将激光光束调节到望远镜视场的中心位置。
Then a cross scanning of beam is presented to adjust the laser beam until it falls in the center of the telescope field of view.
提出了一种十字形光束扫描方法将激光光束调节到望远镜视场的中心位置。
Then a cross scanning of beam is presented to adjust the laser beam until it falls in the center of the telescope field of view.
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