Title
Great Pyramid of Cheops at Giza as astronomical observatory
Caption
Great Pyramid of Cheops at Giza as astronomical observatory, 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 time of solstice and equinox. Illustration of Piazzi Smyth's theory
1891
Wood engraving
Date
1891
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP07095_390001234
License type
Rights managed
Available size
22,3Mb (1,4Mb) / 11,8in x 7,3in / 3543 x 2201 (300dpi)