الفهرس 
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Abstract
The Egyptians had used many cubit units with different values throughout their different historical eras, one of the most famous of which was the Egyptian royal cubit, which Egyptologists recognized as equal to 52.37 centimeters or 20.62 inches, as many of them believe that this cubit was used during the construction of the Great Pyramid of Giza. Whereas the base-length of the pyramid is approximately 440 Royal cubits, and this previous amount did not explain to us the purpose of building the base of the Great Pyramid in this amount. But according to this study; The cubit that was used in building the Great Pyramid is exactly 48 centimeters or 18.879 inches, as this previous value matches exactly the external dimensions of the Great Pyramid and its internal corridors and chambers, for example; the base- length of the pyramid with the deduced cubit would be exactly 480 cubits without any fractures.
There were some specific objectives that captured the researcher’s attention during this study, including, for example; identifying the values of the cubit units known to the Egyptians and many nations, peoples and civilizations of the ancient world, which were used throughout different eras. Identifying some values of the cubit unit that some scientists and authors have deduced and attributed it to the dimensions of the Great Pyramid. Trying to deduce a value of the cubit through the previous points that are consistent with the dimensions of the Great Pyramid, by trying to apply them and comparing them with the external dimensions of the Great Pyramid and its internal corridors, chambers and small surfaces, to know the purpose that the designers of the Great Pyramid intended in building the pyramid with these dimensions, so the researcher used the deductive (deductive) approach.
some of the most important results of this study were that: The real value of the cubit used by the ancient Egyptians during the construction of the Great Pyramid of Giza is 48 centimeters, so the base-length the pyramid would be about 480 cubits by the deduced cubit, or 230.4 meters. It has also been proven that there is a relationship between the length of the pyramid’s base and the length of the king’s burial chamber, whereas the square root of the base-length of the Pyramid in deduced cubit gives the length of the king’s burial chamber in deduced cubit, which equals 21.9089 cubits or 10.516 meters. The square root of the length of the king’s burial chamber gives the length of the coffin inside the king’s chamber in deduced cubit, which equals 4.680690 cubits or 224.67 centimeters. The length of the average terrestrial degree of Egypt can be deduced, by multiplying the base-length of the Great Pyramid in the same number of cubits included in the base, accordingly, the terrestrial degree is approximately 230,400 cubits, or 110,592 kilometers, and from this, it is possible to get the circumference of the Earth and its radius. Thus, the ancient Egyptians would be considered the first people on Earth to measure Earth circumference, which would be equal to 82,944,000 cubits, or 39,813,120 meters.