BLOG-0-mania

The north-south stripe had been known as the Rose Line. For centuries, the symbol of the Rose had been associated with maps and guiding souls in the proper direction. The Compass Rose—drawn on almost every map—indicated North, East, South, and West. Originally known as the Wind Rose, it denoted the directions of the thirty-two winds, blowing from the directions of eight major winds, eight half-winds, and sixteen quarter-winds. When diagrammed inside a circle, these thirty-two points of the compass perfectly resembled a traditional thirty-two petal rose bloom. To this day, the fundamental navigational tool was still known as a Compass Rose, its northernmost direction still marked by an arrowhead... or, more commonly, the symbol of the fleur-de-lis.

On a globe, a Rose Line—also called a meridian or longitude—was any imaginary line drawn from the North Pole to the South Pole. There were, of course, an infinite number of Rose Lines because every point on the globe could have a longitude drawn through it connecting north and south poles. The question for early navigators was which of these lines would be called the Rose Line—the zero longitude—the line from which all other longitudes on earth would be measured.

Today that line was in Greenwich, England.