Weltzeituhr

The World Clock on Berlin's Alexanderplatz is an iconic timepiece that has become one of the capital's best-known meeting points since it was unveiled in 1969. The structure, also known as the Urania World Clock, was built as part of the extensive redesign of the square during the East German era. It was designed by Erich John, who also oversaw the construction. The clock is a ten-tone metal rotunda that stands on a column and contains a symbolic representation of the world. The names of 146 places are stamped into its surface, along with a marker for the International Date Line. Since July 2015, the clock has been a protected monument, which underscores its cultural and historical value.

Architecturally, the clock consists of a cylinder divided into three sections, whose 24 sides correspond to the Earth's 24 main time zones. The names of major cities are milled into the aluminum, while an hour ring turns through the time zones to show the local time. Above the cylinder, a simplified model of the solar system rotates, complete with planets and their orbits. The technical equipment sits two meters below ground in a special chamber. The drive was originally provided by a converted Trabant gearbox and an electric motor made in East Germany. During a major renovation in the late 1990s, the technology was modernized, and the hour ring is now driven by a new geared motor that is synchronized by a precise control system of cams and switches to prevent timing errors.

For visitors, the World Clock is not only an architectural highlight but also a place of great historical significance. In the 1980s it served as a backdrop for political protests, including a Green Party demonstration in 1983 and a peaceful march during the political upheaval of 1989. Today it attracts tourists and locals alike, who marvel at the interplay of clockwork and planetary display. The clock has also left its mark on popular culture, appearing in music videos and as a motif on postage stamps and commemorative coins. Despite being splattered with paint in 2023, the clock was cleaned and remains a central symbol of Berlin's history and identity.