WIWI: It tells time. It has two faces. It shows the movement of the stars. It shows the orbit and phase of the moon. It compensates for annoying forces like gravity that affect the accuracy of lesser watches. It has no battery. Only 2 are made each year. It is totally ridiculous.The Patek Philippe Sky-Moon Tourbillon may quite possibly be the most complicated (and therefore desirable) watch currently in existence. In addition to an absurd sounding name - (I had to wiki "tourbillon" to find out that it refers to a "mechanical watch escapement that counters the effects of gravity and other perturbing forces that affect the accuracy of a chronometer." Now all I have to do is wiki "escapement") - this manually-wound stack of gears, springs and levers also manages to contain a perpetual calendar with a retrograde date display, a minute-repeater, accurately depict the motion of the nocturnal sky relative to where you are, show the position and phase of the moon, display the lunar as well as the sidereal time (that is, the time as measured by the diurnal motion of the vernal equinox - wiki that) - and have a gong. Yes, a gong. According to the company, more than 25 trillion gear-ratio combinations were computed before arriving at the one that achieves the smallest error for all of the displays. As a result, the lunar time is accurate within 38.5 seconds per century, the sidereal time to within 33.8 seconds per century, and the moon phase to within 6.51 seconds per lunation.
What time is it? Who cares?
$620,000
