The Orthodox calendar is an ancient invention of mankind, which today deserves popularity. This calendar reflects all periods of life that are important for the life of a church person. And since the church plays a significant role in the life of modern society, it is difficult to surprise the popularization of Orthodox calendars. In the Orthodox calendar, we reflected the most significant events of the church life: the great holidays, fasting, the days of commemoration of the departed. In those cases when it comes to "mobile" holidays and other significant events, we indicate the dates until 2020. In addition, with the help of our calendar, all interested people can independently calculate the dates of certain events in the life of an Orthodox person.