right|thumb|Marker located at the 45×90 point near Rietbrock The Marathon County Park Commission has posted a geographical marker that identifies the spot (45°N, 90°W) of the exact center of the northern half of the Western Hemisphere, meaning that it is a quarter of the way around the world from the Prime Meridian and halfway from the Equator to the North Pole.
right|thumb|Marker located at the 45×90 point near Rietbrock The Marathon County Park Commission has posted a geographical marker that identifies the spot (45°N, 90°W) of the exact center of the northern half of the Western Hemisphere, meaning that it is a quarter of the way around the world from the Prime Meridian and halfway from the Equator to the North Pole.