What does the 1:43,200 scale carved into the Great Pyramid mean?
Multiply the original pyramid height by 43,200 and you get the Earth's polar radius; multiply the base perimeter by 43,200 and you get the equatorial circumference. Hancock argues this number ties to ancient numeric sequences (multiples of 72) linked to precession.
How precise are the pyramid's base measurements?
Each side is about 750 feet and the four sides vary by only fractions of an inch, precision necessary to avoid cumulative errors that would deform the pyramid.
How accurately is the Great Pyramid aligned to north?
It is aligned to true (astronomical) north within 3 minutes of arc (3/60 of a degree), not to magnetic compass north.
Why do some argue pyramid building declined after the Fourth Dynasty?
After Giza the external structural coherence of pyramids deteriorated—later examples lost the precise workmanship seen at Giza—suggesting a discontinuity or loss of the specialized knowledge and organization used earlier.
Is there evidence for hidden structures beneath the Giza plateau?
Ground-penetrating radar surveys have suggested large anomalies or chambers hundreds of feet beneath the second pyramid; proponents call for further scientific investigation while many mainstream archaeologists remain skeptical.