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The basic theoretical information on astronomy, tasks of the Olympiad rounds of different levels and examples of their solutions are presented. The first section contains the school astronomy curriculum. The second section contains brief basic theoretical information on spherical astronomy (astronometry), the concept of time and its measurement, planetary configurations and motions, Kepler's laws, astrophysics, and photometry. The appendices contain the main physical and astronomical constants, names, coordinates and luminosity of the brightest stars, physical parameters of the planets and elements of their orbits.

For pupils, teachers, students.