Daniel Roth will unveil the Perpetual Calendar Time Equation with days of the month indicator at Baselworld 2007. Aside from the typical perpetual calendar functions of the day, date, month and moonphase, this watch also has the equation of time function, which indicates the difference between mean time (the time you see on a watch) and actual solar time.
Horolography - noun, the art of photographing timepieces
Horolographer - Harry SK Tan
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