World Images
The world as seen through the lens of a camera
The Ancient Beijing Observatory
Beijing, China
The Quadrant (A.D. 1673) designed for measuring altitude or zenith distances of celestial bodies
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World Images The world as seen through the lens of a camera |
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The Ancient Beijing Observatory Beijing, China |
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The Quadrant (A.D. 1673) designed for measuring altitude or zenith distances of celestial bodies |
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