Meridian Panel - Brooklyn Botanic Garden - Brooklyn, New York, USA. According to : The panel is of black Belgian marble terrazzo, has imbedded in it the geographical and magnetic meridians, and the following data: At the North End: Magnetic north Variation, 11° 11' west (in 1931) Annual increase, 4' At the South End: Altitude above mean sea level, 115 feet North latitude, 40° 40' 06" Longitude west of Greenwich, 73° 57' 48" To the North Pole, 3416.7 statute miles To the Equator, 2798.2 statute miles