The history of watches began in 16th century Europe, where watches evolved from portable spring-driven clocks, which first appeared in the 15th century. The watch which developed from the 16th century to the mid 20th century was a mechanical device, powered by winding a mainstring which turned gears and then moved the hands, and kept time with a rotating balance wheel Date facts The first calendar was created in 1582, when Pope Gregory XIII introduced his Gregorian calendar , Europe adhered to the Julian calendar , implemented first by Julius Caesar in 46 B.C. Since the Roman emperor's system miscalculated the length of the solar year by 11 minutes, the calander had since fallen out of sync with the seasons.
