Equinox Light Effects and the 8-Sided Pyramid

During the spring and autumn equinoxes, the Great Pyramid's concave faces create a remarkable shadow effect. For a few seconds at sunrise, the southern face is split into two halves by a line of shadow, revealing the structure's subtle 8-sided geometry. This effect was first photographed by a British Air Force pilot in 1940. The concavity is extremely slight (less than 1meter over the face width) but precisely engineered. Some researchers suggest this was an intentional calendar marker, as the equinox shadow appears only twice per year at exactly the right moment. No other known pyramid exhibits this feature.