| 单词 | coelostat |
| 释义 | Word Frequency coelostat(ˈsiːləˌstæt) noun 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 Compare siderostat Word origin C19 coelo-, from Latin caelum heaven, sky + -stat |
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