This graphic can help to illustrate my point on revisit time better than words alone. At the Equator, there is about 25,000 miles of land mass that WorldView-3 (or any satellite for that matter) can possibly see. And then from 50 to 60 degrees North or South latitude, this same satellite can see about 18,500 miles. This means that WorldView-3 can see the same location at 50-60 degrees latitude more often than at the Equator as it has less land to potentially image as it moves to the Poles, but the same number of physical rotations around the planet. (Graphic Source: University of California Berkeley)