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A. Lange & Söhne

How to set the 1815 moonphase ?

 

How can a moonphase like this be set accurately ?

I mean if it deviates around -3 second a day, how can this be proven, tested ?

I do not own the Lange 1 moonphase, that has the a similarly acurate moonphase, so therefore I can not say if it is mentioned in the booklet to to watch.

It might be not the biggest issue regarding this watch, but I like to test and see wheter the watch is keeping performance.

I tested the Ellipse and noted a gain of ten seconds a day, bougth from new.

As I was not "happy" with that I send it back to service and it came back with a gain of only 2 sec per day.

Both, the technical marvel of this caliber 240 and the oustanding service at Patek was a real pleasure !

So, not to come across as a technical geek or as a philistine:

How can such a moonphase be set properly ?

I have my own idea to that question, but would like to hear other suggestions or somebody knows the true answer.

Many thanks

Moritz

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