The 45x90 points are the four points on earth which are halfway between the geographical poles, the equator the Prime Meridian and the 180th meridian*. The best-known and most frequently visited such point is 45°0’0” N 90°0’0” W which is located on land at 1,345 feet above sea level in the town of Rietbrock, Wisconsin near the unincorporated community of Poniatowski. This point is the center of the Northwest Hemisphere. The original geographic marker was placed by the Marathon County Park Commission at an incorrect location, but was removed and relocated to the correct location in 2017. The only other 45x90 point on land is 45°0’0” N 90°0’0” E, which is at an elevation of 3.311 feet above sea level and is in a desolates region of the Xinjiang Uyghur Autonomous Region of China, near the Mongolian border. *The Prime Meridian is at 0 degrees latitude. The Anti-meridian is at 180 degrees latitude. Together they form a great circle that divides a spheroid (the earth) into two hemispheres (eastern and western). |
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| Pathway to 45x90 Marker in Marathon County, Wisconsin |
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