Aerospace Instrument-Making Annotation << Back USE OF A PARALLACTIC COORDINATE SYSTEM FOR NAVIATION MEASUREMENTS S.N. Guzevich The article is a development of the use of a parallax coordinate system in a location. The description of the location in the parallax system provided its linear description, the reliability of measurements and an increase in the resolution. It is shown that the parallax coordinate system is built according to the postulates and axioms of Euclid, which are used only partially. The use of Euclid's postulate for the purpose of binding the position of the field source relative to the center of coordinates of the Earth is considered. Geometric and physical aspects of such a description are shown that are not available in the scientific literature. Ensuring the reliability of controlled resolution is the basis for the use of a parallax coordinate system as a theoretical basis for navigational measurements and the need to study Euclid's postulate at school. Keywords: pairing, image of an object, pair projective coordinate system, base, reliability, parallactic coordinate system, paired parameters of objects, rationing, relativity, resolution, gradients of parameter increments. DOI: 10.25791/aviakosmos.12.2020.1194 Pp. 35-45.