Description: In the article the results of theoretical and experimental researches of fluctuation error of measuring of angular coordinate of littlepitch aim are presented at her location within the limits of line-of-sight, conditioned by casual heterogeneities of environment. Dependences of fluctuation of corners of arrival are in-process presented on a corner the places got as a result of theoretical calculations and experimentally. A comparative analysis shows the good coincidence of results of calculation with an experiment in the meter range of waves. It is reasonable, that at a location in the zone of line-of-sight and under the corners of place more than 5° random errors less than than regular, and outside distance of line-of-sight these errors in 2 - 3 рази the regular exceed.
Keywords: random errors, heterogeneities of troposphere, fluctuation of corners of arrival