. . . "Geodesy (/d\u0292i\u02D0\u02C8\u0252d\u0268si/), \u2014 also known as geodetics or geodetics engineering \u2014 a branch of applied mathematics and earth sciences, is the scientific discipline that deals with the measurement and representation of the Earth, including its gravitational field, in a three-dimensional time-varying space. Geodesists also study geodynamical phenomena such as crustal motion, tides, and polar motion."@en . .