Kupala Night, also known as Ivan Kupala Day (Feast of St. John the Baptist; ; ; ; ), is celebrated in Ukraine, Belarus, Baltic countries and Russia currently on the night of 6/7 July in the Gregorian or New Style calendar, which is 23/24 June in the Julian or Old Style calendar still used by many Orthodox Churches. In Poland (Mazowsze and Podlasie) it is celebrated on the night of 23/24 June. Calendar-wise, it is opposite to the winter holiday Koliada. The celebration relates to the summer solstice when nights are the shortest and includes a number of Slavic rituals.