Starting with the complications, you’ve got a bevy of all the “grand” things that together combine to make a “supercomplication.” First, there are the six patented functions: the chime, the running equation of time, display of sunset and sunrise, the rotation of the sky and moon, the rapid calendar corrector, and the dual-sided sprung covers, operated by a push-and-rotate Calatrava cross on the bow.
The watch has “Westminster Chimes,” perpetual calendar, power reserve, sky chart, lunar orbit and moonphases, visible horizon, and more. The chimes on the Star Caliber 2000 perfectly replicate the famous ones found on “Big Ben,” an addition that required quite a bit of work from Patek’s watchmakers. For more reading on that, I’d recommend this article from Collectability.