ng 中文名称:定天镜 英文名称:coelostat 定天镜 - 正文 将太阳光反射到恒定方向的光学装置,由两块平面镜组成。第一平面镜,又称定天镜,置于没有赤纬轴的赤道式基架中(见图),镜面与指向天北(南
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N an astronomical instrument consisting of a plane mirror mounted parallel to the earth's axis and rotated about this axis once every two days so that light from a celestial body, esp the sun, is reflected onto a second mirror, which reflects the beam into a telescope 定天镜 → compare siderostat
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