Wiki Impact noun. the striking of one thing against another; forceful contact; collision: The impact of the colliding cars broke the windshield. an impinging: the impact of light on the eye. influence; effect: the impact of Einstein on modern physics. an impacting; forcible impinging: the tremendous impact of the shot.
Just about anything with effect on someone or some thing. Not to forget the impact of the last 6 months on us all.
The reason why the sun sets in the evening is because it wants to see the sunrise in the morning. I rise in the morning because I want to see them both. RvdB