High above the heads of church visitors, almost invisible in the arches of the cathedral, a tiny hole lets in a beam of sunlight. This beam is what allows the meridian line to function. Photo: GEOFF MANAUGH
High above the heads of church visitors, almost invisible in the arches of the cathedral, a tiny hole lets in a beam of sunlight. This beam is what allows the meridian line to function. Photo: GEOFF MANAUGH
