With a help of a laser gyro such instruments as goniometers, devices for measurement of the glass refractive index, geodesic and astronomical angle measuring devices and other can be developed. The utilization of laser gyro in angle measuring instruments allows to increase the accuracy, reliability and measurement reproducibility, to decrease the time of measurements, to automate the process of angle measurements. The scheme of goniometer on laser gyro base and its operation algorithms are presented Mathematical model for an angle measurement error is also presented. The analysis of measurement error components has been carried out. We paid special attention to the effect of the Earth's angular rate on the angle measurement error and showed the ways for reduction of this component of the error. International comparisons results are presented as well.
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