Epiphany

Epiphany (Greek: epiphaneia, “manifestation”) also known as Feast of the Epiphany, Theophany, and Three Kings’ Day, is a Christian holiday commemorating the stated manifestation of Jesus Christ to the Gentiles and the stated manifestation of his divinity, celebrated on January 6 or January 19 by different churches.

The word "epiphany" may more generally also refer to a sudden realization or discovery.