Photographic book
Photo of an old sundial on the wall of a house in Nuremberg in Bavaria

Photo of an old sundial on the wall of a house in Nuremberg in Bavaria


A sundial is a silent and motionless instrument that indicates solar time by moving the shadow of an object of variable shape, the gnomon or the style, on a surface, the table of the dial, associated with a set of graduations plotted on this surface. The table is generally flat but can also be concave, convex, spherical, cylindrical, etc.

The gnomon usually indicates the time by the length or direction of its shadow. On the current dials, the shadow-bearing element is generally an axis (or the edge of a plane) inclined parallel to the axis of rotation of the Earth or axis of the world. It then takes the name of "polar style". This inclination, the angle of which depends on the latitude of the place, makes it possible to read the time all year round directly on the same set of graduations: the range of hour lines. The sundials have several forms: round, rectangle, square, etc. The sundial is considered, because of its simplicity, as one of the first objects used by man to measure the flow of time. The oldest known solar indicators were found in Egypt, but they indicated only indefinite moments and not hours in the sense we hear them today. The first real sundials are probably polos and scaphé, based on the sphere, supposed to be introduced by Berose in ancient Greece in the fourth century BC. J.-C .; other models derived from it (hemispherical, conic, plan ...), inventoried in the ancient dials. © Photo of Emmanuel Buchot

Photos of European countries to visit

Photos Czech Republic

Czech Republic

Photos Informations

Hungary Pictures

Hungary Pictures

Photos Informations

Spain photos

Spain photos

Photos Informations

Scotland Photos

Scotland Photos

Photos Informations

Photos of Portugal

Portugal

Photos Informations

Photos England

Photos England

Photos Informations

Pictures Amsterdam

Netherlands

Photos Informations

Photos of Asian countries to visit

India photos

India photos

Photos Informations

Photos of Hong Kong

Hong Kong

Photos Informations

Images from South Korea

South Korea

Photos Informations

Cambodia photos

Cambodia

Photos Informations

Photos of Japon

Photos of Japon

Photos Informations

Photos of Thailand

Photos of Thailand

Photos Informations

Photos of Taiwan

Photos of Taiwan

Photos Informations

Photos of America

Website information