Great Pyramid of Cheops at Giza, demonstrating

Great Pyramid of Cheops at Giza, demonstrating Piazzi Smyth's theory that passage from subterranean chamber, A, was used to observe the Pole Star at its lowest culmination, while the passage from higher chamber was used to observe Pole Star at its upper culmination. Engraving circa 1890

Cheops Culmination Demonstrating Giza Higher Lowest Observe Piazzi Pyramid Subterranean Theory

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