Ukrainian Physical and Mathematical Lyceum elective course

Here you can find short notes from course lectures, tasks that were solved during meetings, and their solutions.
4) Named configurations
5) Spherical coordinate systems
6) Spherical trigonometry
8) Magnitudes + parallax
9) Proper motion of the stars
10) Hertzsprung–Russell diagram
11) Interstellar extinction
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May heaven send us a path with the moon and stars!