Quoting from the book, THE STONES and the SCARLET THREAD​ by Bonnie Gaunt (pg.130)

​"The years of man were obviously planned with precision, for the 2520 years from the sin of Adam to the first Passover is not just a random number. It's the Biblical number for 'seven times' - 7 x 360 = 2520.  How beautifully it tells the story of the scarlet thread, for the numerical value of the word 'scarlet' is 360. This time span, from the sin of Adam to the Passover is, in fact, seven times scarlet. This 2520 years can be computed from the Biblical record. Basically it is:

1656 years from Adam's sin to the Flood

  864 years from the Flood to the Exodus

2520 years from Adam's sin to the Exodus (the First Passover)

For over a century, it has been known that the numerical value of the total of the words quoted above from Isaiah 19:19-20 adds to 5449, and the height of the Great Pyramid, from its base to its summit is 5,449 Pyramid inches. This accuracy in the numerical value of text could not have been the expertise of Isaiah, but stands as one more proof to the Inspiration of Scripture. The God of Eternity has planted His signature on both the Great Pyramid of Giza and the very words of Isaiah 19:19-20.

The following 3 diagrams are from Bonnie Gaunt's book, The STONES and the SCARLET THREAD.

Ancient Egypt was divided into two parts; Upper and Lower Egypt, and there is only one structure that existed in antiquity that is still in existence today that is both located on the exact border of the two Egypts and in the middle of the country as a whole. This structure had to remain 'til our time, for our passage says, "In that day..." - a phrase always pertaining to the End of Days. This structure is the Great Pyramid at Giza.

• What structure in the land of Egypt could be considered both "an altar to the Lord" and "a pillar"?

• And how could one structure (for the text says, "it", meaning, it's singular) be both "in the midst of Egypt" and at the same time also be "at the border"?