It's hard to imagine a world without a universal time standard, yet it was only in 1884 that 25 nations agreed to adopt the Greenwich Meridian as the Prime Meridian of the World at a conference in Washington. This marked the beginning of the universal time standard we use today. Prime Meridian was defined by the position of the large “Transit Circle” telescope in the Royal Observatory’s Meridian Building. The panorama shows a queue of young people waiting their turn to be photographed astride the Meridian line in the grounds of the Observatory, with a foot in both Eastern and Western hemispheres. The stainless steel sculpture piercing the line was erected in 1999.