Seoul became the capital in 1394. This physical marker identifies the geographical center of Seoul that is still used as a national reference point. In the more common international scheme created in 1851 that uses the equator and the prime meridian running through Greenwich, England, the location of the marker is at 37 degrees 33 minutes 6.6 seconds North, 126 degrees 59 minutes 19.6 seconds East with a height of 267 meters.