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The origin of many time zone watches?
Watchmakers have conceived ways to simultaneously read time in different time zones, ranging from a two-hour wristwatch to a Worldwatch that includes all 24 time zones. Highly sophisticated features now gain unprecedented success. There was an era, every region, or even every town, with its own local time, more or less longitude. As new modes of transport and railways expand, the demand for standard time systems increases. Therefore, at the International Meridian Conference held in Washington in 1884, the participants decided to divide the earth into 24 time zones. Starting from the primary meridian (zero longitude) of Greenwich, each time zone spans 15 ° longitude (1 hour). This system was gradually accepted by all countries. The first watch with dual time zones has two separate movements and two dials. This system was later improved by removing a movement and introducing a "clutch" device for the second hour hand. Nowadays, two, three, four, and sometimes even multiple time zones are available for all types of watches due to the fact that manufacturers are constantly exceeding themselves in readability and ease of use. Most of these watches in the form of pointers, in different colors or shapes, in an extra area to show time. Other watches prefer the window form. The wearer presses a button to select one or the other time zone usually indicated by the city. Multi-time zone watches typically incorporate other features that travelers enjoy, such as day / night or 24-hour indicators (to avoid waking someone up at midnight), alarm or time zone changeovers. Even rarer, "World Time" (International Standard) watches display 24 time zones simultaneously on a rotating disc engraved in 24 international cities.