# Proving that a certain point lies on the euler line

I have an acute angled triangle $$ABC$$ with $$H$$ as the orthocentre of the triangle. Let $$DEF$$ be the orthic triangle of triangle $$ABC$$. $$D',E',F'$$ are the reflections of H on sides $$BC,CA,AB$$. $$A'$$ is the point of intersection of circumcircle with diameter $$HD'$$. Define $$B',C'$$ similarly. Prove that $$AA',BB',CC'$$ are concurrent at a point on the euler line of triangle $$ABC$$.

How do I prove this?