![]() It is important to understand that automatic watches also require a manual wind every so often. The Rotor is attached to the back of the movement, and when the watch is in motion (with regular wear) the rotor spins around the inside of the watch and "automatically" winds the watch, thus eliminating the need to constantly manually wind the watch. ![]() Automatic Winding Movement An Automatic watch operates with the same principle as a mechanical manual wind watch - with the addition of a weighted pendulum called the "Rotor". The countdown is repeated continuously until the stop button is pushed. Auto Repeat Countdown Timer A countdown timer that resets itself as soon as the preset time has elapsed and starts again. Aperture A small opening/window found on the dials of some watches in which certain indications are given, such as the hour and the date. This watch will correctly adjust for short and long months however, it will not correctly account for leap year - when, once in 4 years, an additional day is added to February making it a 29 day month. Annual Calendar A complication showing the date day and month at the minimum. This is also known as duo display or an AnaDigi watch. Analog/Digital (Duo) Display aka Anadigi A watch that displays the time, both by hour and minute hands, (an analog display) and by digital digits (a digital display). Recording ascent and descent, an altimeter watch is an important piece of equipment for climbers, walkers, mountaineers and, of course, aviators. ![]() Altimeter An altimeter measures altitude, or height above sea level. Alarm A function on a watch that will make a sound or vibration at a preset time.
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