Abstract
The article describes a method based on the relationship of the integral index of refraction of air with its integral altitude gradient. The refractive index N and its altitude gradient dN / dH are proportional to each other under conditions of limited atmospheric height. It has been established that the gradient of the refractive index can be found by the index itself with a known coefficient of coupling between them. Wherein, it is easy to find the gradient by the angle of complete refraction. Results of experimental studies and recommendations for its use are given. A correlation analysis of the results of synchronous measurements was performed.