The Orthocenter and CIrcumcenter are Isogonal Conjugates

The orthocenter and circumcenter are isogonal conjugates. The reflections of the orthocenter (H) lie on the circumcircle.[br][br]The common pedal circle of H and O is the nine-point circle.
The Orthocenter and CIrcumcenter are Isogonal Conjugates
– Steve Phelps

Information: The Orthocenter and CIrcumcenter are Isogonal Conjugates