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Scroll down to question IX
...Sir Isaac Newton took a special interest in the sacred geometry of the Great Pyramid at Giza in Egypt and speculated that its inner labyrinth of tunnels and chambers was a prophecy calendar in stone, ...(snip)... if you mark off one pyramid inch (a value inherent within the structure) as representing one year, and measure along a baseline that extends from the Pyramid casing stone exterior and runs parallel to the Ascending Passage, the Grand Gallery, the Antechamber, and King's Chamber, you can discover that the Pyramid's stonework design points out significant spiritual events in the history of humanity, past and future.
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It appears that the Great Pyramid was never finished since the top is flat, and not pointed, as it should be. It has a truncated summit which is coarse and uneven and measures about 30 square feet. Most pyramids were crowned with a top-stone that completed their structure. This pyramid does not currently have one and it appears that it never did. One of the earliest references to the missing top-stone (or capstone) is from Diodorus Siculus (60 BC). He tells us that in his day, when the Pyramid stood with its casing stones intact, the structure was "complete and without the least decay, and yet it lacked its apex stone".