The **School Astronomical Olympiad by Correspondence (SAOC)** is an international astronomy and astrophysics competition for school-aged students, organized under the auspices of the **International Astronomical Union (IAU)**. Participants receive challenging theoretical and problem‑solving tasks in astronomy, astrophysics, and related physics topics and submit their solutions remotely (by email or online forms), making it accessible to students worldwide regardless of location. SAOC is aimed at motivated secondary school students with a strong interest in astronomy and physics, typically at the high school level. It helps participants deepen their understanding of celestial mechanics, observational astronomy, stellar evolution, and cosmology, while practicing rigorous analytical and mathematical reasoning. By engaging in multi-stage correspondence rounds, students can build Olympiad-style experience that can support preparation for national and international astronomy competitions and strengthen their academic profile for future STEM studies.