A fact not so well known, is the unusual feature of the Great Pyramid is a concavity of the core that makes the monument an eight-sided figure, rather than four-sided like every other Egyptian pyramid. That is to say, that its four sides are hollowed in or indented along their central lines, from base to peak. This concavity divides each of the apparent four sides in half, creating a very special and unusual eight-sided pyramid; and it is executed to such an extraordinary degree of precision as to enter the realm of the uncanny. For, viewed from any ground position or distance, this concavity is quite invisible to the naked eye. The hollowing-in can be noticed only from the air, and only on the equinoxes. This explains why virtually every available photograph of the Great Pyramid does not show the hollowing-in phenomenon, and why the concavity was never discovered until the age of aviation. It was discovered quite by accident in 1940, when a British Air Force pilot, P. Groves, was flying over the pyramid. He happened to notice the concavity and captured it in the now-famous photograph (top image).
The photo above illustrates the curious optical phenomena that appears on the pyramid without its casing, at dawn and sunset at the time of the equinoxes (around 21 March and 22 Sept), a shadow appears on the south face of the great pyramid, apparently dividing it in half, with the shaded side nearest the sun.
This poses some more interesting questions regarding our ancient past.. How did a civilization that was supposedly ‘not as advanced’ as us build these by-hand and with such precision to create this concavity that is only seen from the air and on the equinoxes? Not all is what it seems and our ancient history may be very different from what the elite-controlled mainstream will acknowledge.
The purpose for the concavity of the Great Pyramids remains a mystery and no satisfactory explanation for this feature has been offered. The indentation is so slight that any practical function is difficult to imagine unless that is its exact function was to highlight the day of the equinoxes.
Ancient Knowledge Pt.3 Pyramids, Monuments & Megaliths, Ley Lines (Earth’s Energy Grid)
Sourced from: Ancient Wisdom