On June 25, several important events are celebrated in Ukraine and around the world, including international dates, professional honors, and folk beliefs. Despite the calendar summer, in the traditional view this day has a not entirely light energetic meaning.
In the international calendar, the date is dedicated to the Day of Slavic Unity, a holiday designed to emphasize the common cultural roots of Eastern European peoples. It is celebrated in several countries, including Ukraine, Poland, the Czech Republic, Slovakia, Bulgaria, and other countries where Slavic languages and traditions have a historical basis.
June 25 also marks the beginning of the Islamic New Year, a holiday with a movable date determined by the lunar calendar.
In Ukraine, today is a professional holiday for customs officers. Their role in ensuring national security, economic control, and combating smuggling is difficult to overestimate, especially in times of war. Customs officers are responsible not only for following procedures, but also for identifying risks associated with the import of potentially dangerous goods.
In the church calendar, the date is associated with the veneration of the icon of the Virgin Mary "The Deliverer" and the martyr Fevronia. In communities that use the old style, June 25 commemorates Saint Peter of Athos and the hermit Onuphry the Great.
Folk tradition in Ukraine gave this date special attention. On the day of Fevronia, as she was called by the people, it was forbidden to swim in water bodies - it was believed that mermaids were especially dangerous on this day. This belief led to considerable caution: water bodies were avoided, and children were kept away from rivers and lakes. Spouses were recommended to spend the day together, doing household chores - this was supposed to bring harmony and strengthen the marriage.
Among the signs that have survived to this day, the most famous are those related to the weather: if it is hot on this day, July will be hot, if it is drizzling, the bad weather will last for several days, and croaking frogs portend a heavy downpour.
Special attention was paid to what not to do. It was forbidden to swear, slander, be jealous, and work in the garden. It was believed that violating these rules could have serious consequences for the family.
Despite modernity, many still heed such beliefs — and even in the 21st century, Fevronia's Day remains a symbol of a certain caution and restraint.

