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Thursday, July 30, 2009

The Use of Moonphase

When we talk about “moonphase”, you must know weather it is “old moonphase”or “new moonphase”. The old is represented by BlancPain watches, the Moonphase dial runs a little distance very day, it runs a cycle every 29 days and 12 hours. The new model is represented by A.Lange&Sohne watches, its moonphase dail moves smoothly. The benefits of the former is simple and solid,but there will be a day of error every two and a half years. The advatage of the latter is litter mistake, 133.6 years passed and it will have one day of error, but some experts worry about the spring which pull the moonphase dial to move will need repaired or change after 50 years later. About the “old moonphase” and the “new moonphase”, which one is better there is not a clear answer.

The moon full or lost means the cycle of the moon arounds the earth. Since ancient times, people used the moon cycle to measure and record time, and ues it to decide when to do religious,farming and the festival. “lunar”or “Chinese” is come from this. On the “lunar”, every new moon means the first day of the month, and every crescent means the first day of a week. One lunar month is only 29 days 12 hours 44 minutes and 2.8 seconds. Now the “solar” is universal, it is base on the earth orbiting the sun, it also has 12 mothes on one year, but every month not has the same day, there are 31 days, 30 days, 28 days or 29 days every four years. A soral calendar has 365.2422 days.

However, using the approximation of 29.5 days to produce the 59 gears moonphase means one lunar calendar will faster 44 minutes and 2.8 seconds, and it will faster one day every two years and seven month. In order to reduce the error, watch expert design another more complex moonphase which has 135 gears, it can reduce the error to 52.7 seconds each month, that means the moonphase need you to adjust about 122 years passed. Such precision can make you never adjust it along your life time, so a lot of replica watch factory use this “new moonphase” to indicate the exactness of moon full or lose.

Article source:http://blog.hellorolex.com

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