... 渐浑照像法，浑映照像法 photographic vignettm 摄影天顶仪 photographic zenith telescope 摄影天顶管 photographic zenith tube ...
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Use a photographic plate to record an image from a zenith-pointing telescope, and you will end up with a streaky image, as a result of the earth's rotation.
ECONOMIST: Mirror, mirror
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