Another way of presenting equation of time is the Marchante, “Running” Equation of Time. In fact, it is not an equation, because it does not involve arithmetic. On the contrary, it is a dynamic display of the solar time. The difference between the mean solar time and the true solar time is clear. The solar time is also located in the middle of the dial, and usually is distinguished through the top decoration of the sun pattern. The hour hand and the regular hour hand coincide four times a year, and soon they are separated again.
For paying tribute to Astronomy
Earlier this year, Vacheron Constantin launched a equation of time watch with a full focus on astronomical features — Les Cabinotiers Celestia Astronomical 3600, which is also the most complex watch ever made in the history of the brand. Calibre 3600 manual winding movement took 5 years of research and development. It Integrates 23 complex functions. The movement is equipped with six spring boxes to drive three independent gear systems: One for standard time (for civil use), second is the solar time ( the top of the pointer is decorated with the sun pattern), third is sidereal time (it uses stars instead of the sun as a guide, it is about four minutes a day different from the flat sun, which can be read from the back of the watch). This watch has also many functions, such as perpetual calendar, moon phase, tides change, seasons, solstitial points, the equinoxes, the twelve signs of the zodiac, and three-dimensional earth, moon and sun position indicator and so on. The back of the watch is a celestial map with the Galactic System, northern hemisphere, and power storage instructions. It is also equipped with sunrise and sunset time display, which is a rare complex function.
In 2000, Audemars Pigeut produced its first watch that has the sunrise and sunset time display. Jules Audemars watches is equipped with perpetual calendar, traditional time equations, special center second pointer which rotates between 9 o’clock and 3 o’clock along the inside scale ring to indicate the difference between the mean solar time and the true solar time.
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