Calendar ritualism of the Opillia region in the scientific works of historians, ethnographers, and specialists in folklore of the XIXth ? XXIst centuries (historiography of the problem)

The article analyses the historiographical problem of calendar ritualism of the Ukrainians in Opillia in the middle of the XIXth ? early XXIst century. The author characterizes works of Ukrainian and foreign scientists of the XIXth ? XXIst centuries. The first works in calendar ritualism were written by the representatives of the “Russian Trinity” and the Ethnographic committee of the Shevchenko Scientific Society.