Astronomy Day
Astronomy Day is held on September 19. Autumn. This event in the second 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 Water Monitoring Day on September 18
International Read an eBook Day on September 18 (The first major celebration of International read an eBook day was in 2014, and was put together by a major eBook distributor OverDrive);
World Bamboo Day on September 18
International Day of Equal Pay on September 18 (established by the UN General Assembly on November 15, 2019. Several countries, including Georgia and Ukraine, sponsored the resolution);
International Grenache Day on September 18 (Celebrated on the 3rd Friday in September);
World Marrow Donor Day on September 19 (is celebrated globally on the third Saturday of September);
World Cleanup Day on September 19 (the third Saturday of September);
International Eat An Apple Day on September 19 (Third Saturday of Septembe);
International Coastal Cleanup Day on September 19 (Held on the third weekend of September);
International Day of University Sport on September 20
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