Astronomical complications control the days dates months and years to different measure depending on the complexity and cost of the movement.
The simple calendar gives you the Day and Date window.
The triple calendar takes the Day + Date complication one step further by adding the month of the year to the Day-Date display. Now, in addition to showing the day of the week and the date of the month, the display will also showcase the specific month.
Staying with the theme of adding to the existing complication, the Annual Calendar adds a new element to the calendar function which already gives the day, the date and the month, and then adds the year to it. This complication does not take into account leap years.
The calendar complication is something we take for granted and that is certainly true of the perpetual calendar.
This may be one of the most useful complications that us without giving it any thought. Have you ever given a thought for leap years? No? well, the perpetual calendar does. With the use of a complex set gearing this complication can plan ahead and display the correct day, date, month, year, and leap year and only needs adjusting once a century.
Equation of time
If you were using a sundial you would see that above the axis the sundial appears fast relative to a clock showing local time and the slow below the axis. The difference here is called Equation of time which describes the difference between two types of solar time, apparent solar time and mean solar time.
The Moon phase put simply is a complication that illustrates the position of the moon in a window on your watch dial. You may well, think this is silly if you consider you can simply look out the window, or just guess the position based on the time of night.
This, of course, is like many complications in that they may not but necessary, but the are a thing of beauty that we take pleasure from on a daily basis.
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