December 21 holidays, events, historyCategory: Короткие факты 0December 21 holidays, events, history 👉 HOLIDAYS: 🇺🇳 World Basketball Day. 🌏 Winter Solstice. 🌏 World Sari Day. 🌏 Birthday of the Crossword. 🔹 NATIONAL HOLIDAYS: 🇮🇷 Iran