The Great Pyramid of Giza has long been lauded as one of the most pioneering feats of engineering, having been built over 4500 years ago.
Built by Egyptian Pharaoh Khufu, it is perfectly designed to align the with the cardinal points of north, south, east and west, although the top is slightly lopsided.
Yet, the answer as to why it was designed in this way has yet be discovered.
But now engineer Glen Dash believes he has finally solved the mystery behind the structure and why it was designed in this way.
The autumn equinox, which occurs halfway between winter and summer solstice, is thought to be behind it.
In published paper Journal Of Ancient Egyptian Architecture, he reveals the secrets behind the 138m tall wonder.
He wrote: “The builders of the Great Pyramid of Khufu aligned the great monument to the cardinal points with an accuracy of better than four minutes of arc, or one-fifteenth of one degree.
“All three pyramids exhibit the same manner of error; they are rotated slightly counterclockwise from the cardinal points.”
The three pyramids mentioned also include the pyramid of Khafre, found in Giza, and the Red Pyramid, found at Dahshur.
He conducted an experiment using a rod on a wooden platform on the day of the autumn equinox in 2016, which was September 22.
“On the equinox, the surveyor will find that the tip of the shadow runs in a straight line and nearly perfectly east-west,” Mr Dash explained.
With the tilt of the Earth, this allowed the shadow to fall east-west that had a degree of error counterclockwise. This mirrors the error found in the three pyramids.
Mr Dash continued: “It is hard to imagine a method that could be simpler, either conceptually or in practice.”
A large chamber was also discovered with the Great Pyramid of Giza last year.
Many have used it to prove that it was actually built by aliens.
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