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In Horology, the study of clocks and watches, a complication refers to any feature in a timepiece beyond the simple display of hours and minutes. A timepiece indicating only hours and minutes is otherwise known as a simple movement. Common complications in commercial watches are day/date displays, alarms, chronographs, and automatic winding mechanisms. The more complications in a watch, the more difficult it is to design, create, assemble, and repair. A typical date-display chronograph may have up to 250 parts, while a particularly complex watch may have a thousand or more parts. Watches with several complications are referred to as ''grandes complications.'' The initial ''ultra-complicated'' watches appeared due to watchmakers' ambitious attempts to unite a great number of functions in a case of a single timepiece. The mechanical clocks with a wide range of functions, including astronomical indications, suggested ideas to the developers of the first pocket watches. As a result, as early as in the 16th century, the horology world witnessed the appearance of numerous complicated and even ultra-complicated watches. Ultra-complicated watches are produced in strictly limited numbers, with some built as unique instruments. Some watchmaking companies known for making ultra-complicated watches are Breguet, Patek Philippe, and Vacheron Constantin.〔(Ultra-complicated watches )〕 ==Grand complications== A grand complication is a watch with several complications, the most complex achievements of ''haute horlogerie'', or fine watchmaking. Although there is no 'official' definition,〔 〕 one common definition is a watch that contains at least three complications, with at least one coming from each of the groups listed below: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Complication (horology)」の詳細全文を読む スポンサード リンク
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