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ART311968 
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Great Pyramid of Cheops at Giza as an astronomical observatory. Diagram showing how the passage to the subterranean chamber (not shown) acted as an observing tube, and how the passage on upper left could be used to observe the time of solstice and equinox. 
Location Ann Ronan Picture Library/London/Great Britain
Unique Identifier ART311967 
Type Image 
Purpose Public 
Size 4140px × 2573px 
Photo Credit HIP / Art Resource, NY 
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Tags
Astronomy
Cheops, Egyptian King (2545-2520 BCE)
Giza, Egypt
Observatory
Pyramid