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 design