A polychronion is a fancy word that describes a special kind of prayer in the Orthodox Christian Church. When we pray, we usually stand or sit quietly and talk to God in our minds or out loud. But during a polychronion, everyone stands up and moves together while saying some special words.
Imagine you're playing a game of Simon Says with your friends. The person leading the game tells everyone what to do, and everyone has to do it together. During a polychronion, it's a bit like that. The person leading the prayer tells everyone to stand up and move in a certain way, and everyone does it together, like a big group dance.
While everyone is moving, they're saying some special words that honor different saints and holy people. These are people who have been very good and kind and helpful in their lives, and the Orthodox Church believes that they're in heaven with God now.
So a polychronion is a way for everyone in the church to come together and honor these special people. It's a way to show respect and love, and to ask for their help in our own lives. And because everyone is moving together, it's a way to feel like we're all part of something bigger and special.