Astronomical Clock
The Astronomical Clock at Oslo City Hall: the clock that shows more than time
The Astronomical Clock at Oslo City Hall is one of the city’s most fascinating public artworks. Here is the story behind the clock, its symbols, and its place on the façade.
On the façade of Oslo City Hall hangs a clock that many people see without ever fully reading. Strictly speaking, it is not an astrological clock but an astronomical clock. That distinction matters. City Hall, at Rådhusplassen 1, was inaugurated in 1950 and remains the seat of Oslo’s central municipal institutions. Set into that monumental brick building is a timepiece that reaches beyond ordinary timekeeping and toward the larger rhythms of the sky.
The clock was designed to show far more than hours and minutes. Sources describe a system of multiple hands and symbols that indicate the movements of the sun and moon, lunar phases, and even how eclipses are represented when specific pointers meet. In other words, it is both a public clock and a civic lesson in cosmology — a decorative artwork that also carries scientific and historical meaning.
The clock measures five metres in diameter, and the zodiac figures were created by sculptor Nils Flakstad. The broader mechanism has been described as a collaboration between engineer Olaf Platou and Ungerer & Cie of Strasbourg. Those details matter because they explain why the work feels so integrated into the building: it is not just mounted on City Hall, but woven into its identity as a modern civic monument with intellectual ambition as well as visual force.
That is also why the clock still resonates. Oslo City Hall is usually associated with politics, ceremony and the Nobel Peace Prize, yet the astronomical clock introduces another register entirely: a slower one. While the square below measures the day in meetings, traffic and timetables, the clock above suggests that time can also be read as cycle, shadow and celestial motion. In that sense, it is not merely an ornament on the wall. It is one of the building’s clearest ideas, made visible.