The pyramid measurement was imperfect human error. What date change are you talking about?
In 1907, the Watchtower deliberately altered a supposed Pyramid measurement by 41 inches to match its changed chronology. No one went to re-measure the pyramid. Instead they just changed the numbers
in bold below in the next edition of the same book with NO explanation. See the date change from 1874 for beginning of time of trouble changed to 1914? It's due to the measurement changes? shhhhh This is no mistake.
Here is an excerpt from Russell’s
Studies in the Scriptures: Thy Kingdom Come, Series III, p. 342. The boldface shows the
changes between the measurements reported in the
1897 and 1907 editions of the book:
1897 edition:
“Then measuring
down the Entrance Passage from that point, to find the distance to the entrance of the ‘Pit,’ representing the great trouble and destruction with which this age is to close, when evil will be overthrown from power, we find it to be
3416 inches, symbolizing
3416 years from the above date, B.C. 1542. This calculation shows A.D.
1874 as marking the beginning of the period of trouble; for 1542 years B.C. plus
1874 years A.D. equals
3416. Thus the Pyramid witnesses that the close of
1874 was the chronological beginning of the time of trouble…” (Russell,
Studies in the Scriptures:
Thy Kingdom Come, Series III, p. 342, 1897 edition)
1907 edition:
“Then measuring
down the Entrance Passage from that point, to find the distance to the entrance of the ‘Pit,’ representing the great trouble and destruction with which this age is to close, when evil will be overthrown from power, we find it to be
3457 inches, symbolizing
3457 years from the above date, B.C. 1542. This calculation shows A.D.
1915 as marking the beginning of the period of trouble; for 1542 years B.C. plus
1915 years A.D. equals
3457. Thus the Pyramid witnesses that the close of
1914 will be the beginning.” (Russell,
Studies in the Scriptures:
Thy Kingdom Come, Series III, p. 342, 1907 edition)