On September 4, 1969, the oldest professor of the Leningrad Mining Institute, Doctor of Technical Sciences, head of the Department of Higher Mathematics Andrey Mitrofanovich Zhuravsky died.

The issues of calculating the coordinates of the points of the borehole axis and the accuracy of determining its spatial position are presented in the works of A. M. Zhuravsky and A. A. Krzhizhanovskaya.