The phenomenon of the sun’s perpendicularity inside the holy feet of Abu Simbel.
According to the phenomenon of the spring and autumn equinoxes and the summer and winter solstice, the Earth rotates on an inclined axis about 23.5 degrees, and this causes an equal occurrence between the hours of night and day on March 21 and September 22
As a result of the sun’s perpendicularity to the equator in March and September, the perpendicularity turns over the Tropic of Cancer in July and the Tropic of Capricorn in December (the two Solstice). During this journey, the sun perpendicular to the sub-latitudes, and this occurs between latitudes 22 and 33 degrees north, and the ancient Egyptian monitored this phenomenon throughout the days of the year by using a rope or thread that ends with a weight or a stone (as the builders use) now in building rural houses. Thus, the location of the shadow’s occurrence was clearly defined, and then began to build or dig the temple in the rock, and this coincides every year after moving the temple on October 22 and February 22, this is a simplified interpretation of an astronomical phenomenon,