Astronomy Day
Astronomy Day is held on September 22. Autumn. This event in the third decade of the month September is annual. 
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In the spring, the holiday is held on the Saturday closest to the First Quarter Moon between the months of April and May, while in the fall (autumn) it occurs on a Saturday closest to the Quarter Moon between September and October.
Similar holidays and events, festivals and interesting facts
World Alzheimer's Day on September 21
World Gratitude Day on September 21 (First celebrated in 1965);
European Cooperation Day on September 21
Feast of the Nativity of the Virgin on September 21 (Orthodox Church);
International Day of Struggle against Monoculture Tree Plantations on September 21
World Protection Elephant Day on September 22
World CML Day on September 22 (Since 2008, patient organizations around the world have initiated events and projects on "CML Awareness Day" on September 22 to raise awareness of the needs of patients living with Chronic Myeloid Leukemia);
World Rhino Day on September 22
International Mixed Berries Muffin Day on September 22
World Rose Day on September 22
International Mime Day on September 22
Day of Combating the Non-Completion of Secondary School Children on September 23
International Rabbit Day on September 23 (Held on the fourth Saturday in September);
International Day against Sexual Exploitation and Trafficking of Women and Children on September 23 (is celebrated every 23 September. It was jointly established by the World Conference of the Coalition against Trafficking in Persons and the Women’s Conference that took place in January 1999 in Dhaka, Bangladesh);
International Day of Sign Languages on September 23 (adopted by the UN on November 14, 2017);
European Mushroom Day on September 23 (Celebrated on the fourth Saturday of September)