Danylo's candidate's thesis (1988) is devoted to the peculiarities of the political, economic, and social crisis of 1917 based on the material of Ukrainian provinces within Russian Empire.

His doctoral dissertation monograph "Political systems of Ukraine 1917–1920: creation attempts and causes of defeat" (2003) was recognized as the "Best Book of the Year."

On Massacres in Volhynia and Eastern Galicia: He considers Bohdan Khmelnytsky an antihero of Ukraine, a man who brought catastrophe to Ukraine, and «a man who sold everyone who could be sold to everyone who would buy it; a man who spent the rest of his life legitimizing this quasi-state is an ugly entity in which people did not exist at all, but this Cossack's peasantry existed as the ruling class.»[2] He is quite critical of the proposed modern Ukrainian historiography and believes that it is «made in Moscow, it is made in other geographical centers, abundantly scattered on the political map of the world.

He is the author of more than 20 monographs, including a four-volume book on the history of the Masonic movement which had a significant impact on the formation of Ukraine as a unique civilizational entity.

In 1992, he was a member of the Heraldic Commission of the Verkhovna Rada, on the recommendations of which the symbols of the new European independent state were established – the coat of arms, anthem, and flag of Ukraine.