Solar Height
The solar Height is the angle between the direction of the solar rays and the horizontal plane taken in our case at its peak at noon.
The solar height depends on the latitude of the point where we are and by the declination thath in turn depends on the day included in the solar year in which the measurement was made.
Starting from the formula to calculate the solar height I get the declination ie the angle that forms the sun at noon on the meridian considered with the equatorial plane which can be positive or negative depending on the season.
α = 90 ° - latitude +/- declination
α = solar height
Latitude of the pyramid of Cheops is 29 ° 58’40.56 ”, in degrees 29.977 °
Declination = 90 ° - 29.977 ° -51.84 ° = 8.183 °