 Rose Line

Rose Line is a fictional name given to the Paris Meridian and to the sunlight line defining the exact time of Easter on the Gnomon of Saint-Sulpice, marked by a brass strip on the floor of the church, where the two are conflated, by Dan Brown in his 2003 novel "The Da Vinci Code".Brown based this on material found in the Priory of Sion documents of the 1960s, where neither the Zero Meridian nor the sunlight line in St Sulpice are called Rose Line.