England. 50°4?30?N, 5°37?15?W]]'s Old Town- a vertical south west decliner dial ]]'s bowstring equatorial sundial, entitled Man Enters the Cosmos, at the Adler Planetarium.]]A sundial is a device that measures time by the position of the Sun.The most commonly seen designs, such as the 'ordinary' or standard garden sundial, cast a shadow on a flat surface marked with the hours of the day. As the position of the sun changes, the time indicated by the shadow changes. However, sundials can be designed for any surface where a fixed object casts a predictable shadow. Most sundial designs indicate apparent solar time. Minor design variations can measure standard and daylight saving time, as well. History , Afghanistan 3rd-2nd century BC.]] Sundial, created for King John III Sobieski by Hevelius in about 1684]]Sundials in the form of obelisks (3500 BC) and shadow clocks (1500 BC) are known from ancient Egypt. It was further

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