지구의 기준선 “그리니치”(I)

Prime Meridian of the World - Greenwich

The Royal Observatory Is the Prime Meridian of the world and of Greenwich Mean Time. All time and space is measured relative to Longitude Zero1000" 00' 00" )which is defined by the crosshairs of the great Transit Circle telescope in the Meridian Building of the Observatory Greenwich Mean Time. GMT is the basis for the international Time Zone System