The summer solstice is an important calendar event for many ethnic groups whose beliefs are based on the solar cult. It has long determined the way of life and traditions of the Britons, Celts, Western, Southern and Eastern Slavs, Japanese, Indians, Koreans, Egyptians and other peoples of the world. The UN, wanting to emphasize the importance of preserving the memory of the ancient cult and national beliefs, established a holiday in 2019.