in NAD27 coordinates. To address these, a new datum was developed, designated NAD83. It replaced the Clarke spheroid with a new ellipsoid, the Geographic Reference System 1980, centered at the Earth's center of mass as determined by the Bureau International de l'Heure. The new datum was based on adjustment of 250,000 points, including 600 satellite Doppler stations. NAD83 was officially adopted by the U.S. government in 1989, and by the Canadian government in 1990. Under the new system, Meades Ranch lost its special standing, and became one of thousands of stations. Description As of 2012, the location of the Meades Ranch station was . It lies about north of Lucas and about southwest of Tipton. The station is on a low grassy ridge in a pasture. It is marked by a bronze disc, inscribed "Meades Ranch 1891", embedded in the top of a dome-shaped concrete marker in diameter, rising about above ground level. Two reference marks and an azimuth mark are located nearby. The Meades Ranch station is on private land, with no public access. A replica of the station marker, with a Kansas historical marker explaining its significance, is located at , in a roadside rest area beside U.S. Highway 281 at the northern edge of Osborne, Kansas, northwest of the Meades Ranch site. See also Geodesy References External links 1940 re-installation At the geodetic center of North America two journal essays Monuments and memorials on the National Register of Historic Places in Kansas United States Surveying and geodesy markers Geography of Osborne County, Kansas National Register of Historic Places in Osborne County, Kansas 1891 establishments in Kansas