Astronomical time difference, also known as time difference, or time equation. Refers to the difference between watch time (ie, average solar time, also referred to as civilian time) and true solar time (also known as actual solar time). Time equation watch: On the basis of a normal watch (flat sun), the addition of a (real sun) display is the "time equation" watch. True sun when the sun is peaceful when the sun: refers to the earth around the sun generated by the daily sunshine length. Within a year, the true sunshade around the world is different every day. That is because the Earth is orbiting, and the distance from the sun is constantly changing. The Earth's orbit is elliptical rather than circular, and the Earth's plane of rotation has an additional 23 ° angle with the orbital plane of revolution, which has led to the fact that the actual duration of a day is not the 24-hour period generally accepted and we are used to indicate The "24-hour" time of the day, measured precisely, is actually not exactly 24 hours a day, but about 15 minutes on a 24-hour basis. It is just 24 hours a day only four days a year: April 15, June 14, September 1 and December 24. However, because the sun is not the same every day, the clock timekeeping is a difficult problem to be solved. Therefore, a relatively easy way to count the time - when the flat sun came into being. Flat sun: The 24-hour daytime chronograph used on most watches to count time is the "average sun hour," or more commonly known as "civil time," a simple time-count that ignores changes in the equation of time system. Astronomically, it is assumed that a sun (a flat sun) runs at equal speed on the equatorial (rather than on the yellow) road at a rate equal to the average speed of a true sun running on the Yellow Equator, the imaginary sun rising twice The day interval, called a flat sun day, is also equivalent to the average year of the true solar day called the flat sun day, and the 1 / 24th sun day as a flat sun. The so-called "day" and "hour" are the abbreviations of the peaceful sun on the peaceful sun. 1/86400 = 1 flat sun of a flat sun, as the basic unit of measurement time. Modern watches are designed and manufactured according to this principle. In 1820, French scientists held a meeting and decided to represent the length of a day by the average value of the Earth's rotation in a week. And by the scientific community unanimously as the standard time measurement. The time standard set this time, which lasted until 1960, is a fairly historic stage. Watch manufacturing, the flat sun as the basis for measurement has been extended to today. Nowadays, people are accustomed to dividing their 24-hour day into two 12-hour periods. 0: 00-12: 00 AM; 12: 00 the next day 0:00 PM. This is the most common usage. Some industries and departments, like to use 24 hours continuous calculation. For example: Astronomy Department, maritime, aviation and other industries, PM6: 30 usually expressed by 18:30, the characteristics of professional employment. Astronomical time difference in the watch The earliest development time Equal watch is the Breguet master Abraham-Louis Breguet's Marie-Antoinette and Patek Philippe's Caliber 89 (and later derived from the movement of the Star Caliber 2000). In contemporary watchmaking, the Breguet is ahead of the 1991 launch of the first time-only equation of the moon phase watch, with pointers in the 1 and 2 o'clock direction of the fan indicates the time difference between the sun, not only won awards, not negative treasure Master inherited the innovative art. Inspired by a watch pocket watch from the 1925 Sunrise and Sunset in Audemars Piguet Museum in 2000, the Audemars Piguet watch factory in Switzerland developed and published the world's first machine with sunrise, sunset, time equation and perpetual calendar Watch. Earlier time equation watches are mostly in the dial plus a positive and negative 15 minutes of display device to indicate the actual solar time with civilian time difference, but only so show, you can only know the difference between the two, the error Which benchmark is not shown. The first time-only watch that shows both the civilian and the sun with two hands at the same time is the Blancpain Le Brassus Equation du TempsMarchante watch, an intuitive way to show that you know both Time difference between the time and the specific speed of the situation, the display at a glance, intuitive and simple. Production process, generally only shows the time difference of the time equation The watch has been the classic method is to add a watch movement according to the "8-shaped curve" made of kidney-shaped cam. The cam rotates once a year. When it is turned, a paddle (or pawl) mounted on it will also move with it. The "figure 8 curve" oval cam indicates the change in the sun's length. A watch with two hands displaying two kinds of time at the same time operates a real sun-hour hand with two non-interfering driving sources, a kidney-shaped cam driving a planetary gear train (a real sun-time handshake), and Drive the driving source of the dial of the dial (that is, the watch chain of the minute hand).
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