What is a dual time watch?
A dual-time watch has two hour hands in order to indicate time in two different time zones. This complication is popular with travelers, as it allows the wearer to set a “home” time zone for quick reference. The second hour hand is sometimes referred to as the GMT or UTC hand. A dual-time watch displays two time zones simultaneously on one dial. Whether you’re crossing continents or keeping in touch with family abroad, this feature allows you to stay connected with multiple regions easily.It allows the wearer to set a ‘home’ time zone—for referring to the time in their country of origin, and a second time zone—for indicating the time of the current location. Traditionally, a dual-time watch has two sub-dials; each one, adjusted to different time zones.
What was the first dual time watch?
In 1925, Longines advanced horological history again by introducing the first dual time wristwatch, the Zulu Time, which displayed both local time and Greenwich Mean Time (UTC+0). The watch featured the signal flag for the letter “Z” – a symbol used by both sailors and aviators in international time communications. A dual-time watch has two hour hands in order to indicate time in two different time zones. This complication is popular with travelers, as it allows the wearer to set a “home” time zone for quick reference. The second hour hand is sometimes referred to as the GMT or UTC hand.
What are the benefits of a dual clock?
A dual-time watch displays two time zones simultaneously on one dial. Whether you’re crossing continents or keeping in touch with family abroad, this feature allows you to stay connected with multiple regions easily. Each degree of longitudinal corresponds to a difference of four minutes. This is because the Earth rotates 360 degrees in 24 hours, 1 degree in 4 minutes. The standard meridian of India is 82 degree 30E, and that of London is 0 degree. So when it is 12 noon in London, it is 5. India.The UK uses Daylight Saving Time (DST) in summer. India does not use DST, so London’s clock changes while India’s does not. Hence, 5 hours 30 minutes difference.For example, in New Delhi, India, they found themselves halfway between two meridians, and therefore decided to be 30 minutes between each, as opposed to adopting one time or the other. Also, even though India’s expansive regions cross two time zones, all of India carries the same time.