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  Columns > Ron DeCorte > Patek Philippe New Nautilus Range

   Published in: January 2007
 
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   Patek Philippe Nautilus Ref. 5712

The Ref. 5712 is the most complicated of the new Nautilus line featuring 48-hour power reserve indication, high-accuracy moon phase, instantaneous calendar (not perpetual), automatic winding, and sub seconds located at the 4 o'clock position of the dial. The instantaneous date mechanism of the 5712 changes “instantly” at midnight every day, unlike most calendar mechanisms known as semi-instantaneous mechanisms that start changing slowly well in advance of midnight.

Ron's Notes : The Moon Phase Complication in the 5712
 
The vast majority of moon phase mechanisms use 29.5 days as the lunar cycle when in fact its average is 29 days, 12 hours, 44 minutes, and 3 seconds, an error of about 9 hours per year. The 5712 addresses this issue via a complex mechanism and reduces this error to less than 12 minutes per year. To put it simply, the 5712 would, in theory, need only one day of lunar correction every 122 years!
 


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