Automatic spacecraft (ASC) orientation is described with an orientation quaternion defined by the platform-free inertial system algorithms using data from gyroscopic meter of angular velocity vector (GMAVV). Redundancy of the GMAVV data allows detecting failures and turning off faulty sensors (up to 2 of 6). GMAVV deflections proportional to time are estimated by the ASC position optical sensor readings with the help of Kalman filter. A telescope orientation accuracy of 30 arcsec is reached by using data of optical sensors mounted directly on the telescopes. The example of such a sensor is "TAUVEX" (Israel) mounted on the telescope "SODART" (Denmark), this sensor data being used in "Spectr-RG" ASC Control System (CS). Scientific telescope angular stabilization accurate to 0.25 arcsec and angular velocity accurate to 10 degree per second is reached by using Kalman estimation of ASC phase coordinates and of its disturbing moments when forming flywheel control signals. During one observation session the CS of power gyroscopic system ensures tenfold automatic telescope reorientation with taking into account restrictions on its position relative to the Sun, the Moon, and the Earth. The autonomous navigation algorithms based on integrating equations of the ASC mass center motion allow the direction of a transmitting aerial towards the Earth measurement point with a 3 angular minute accuracy.