This piece, built by Auguste-Lucien Vérité at the end of the 19th century, is considered a masterpiece of the genre. The clock, made up of 30,000 parts, displays no fewer than 122 fully interdependent readings, including the local time in 20 cities worldwide, date, season, duration of day and night, number of lunar and solar eclipses, solar time, solstices, equinoxes, and so forth.