Exact Date Pinned to Great Pyramid's Construction?

Andrew Bossone in Cairo

ON TV Egypt Unwrapped: The Pyramid Code airs Monday, September 21, at 8 p.m. ET/PT on the National Geographic Channel. Preview The Pyramid Code >>

The Egyptians started building the Great Pyramid of Giza on August 23, 2470 B.C., according to controversial new research that attempts to place an exact date on the start of the ancient construction project.

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