Can shadows whisper secrets of time? Here at the Sonnenuhr, they do. The Sonnenuhr, also known as the Kupferuhr, doesn’t just tell time. It tells a story. A story of ingenuity, precision, and a touch of celestial magic. This equatorial sundial, shaped like a ring, stands as a testament to human fascination with the cosmos. It’s a world time clock, connecting us to the rhythm of distant cities. The Sonnenuhr was originally unveiled in 1951. At that time, it was considered the largest of its kind in the world.
The Sonnenuhr’s design is an intricate dance between art and science. A central rod, the polstab, casts its shadow on a broad band. This band is marked with scales for each month, compensating for the Earth’s elliptical orbit and displaying Central European Time. Roman numerals grace the upper edge, whispering the secrets of true local time. Parallel to this main band is a narrower ring, the world time ring. It bears the names of 200 cities across the globe. This ring can be rotated around the polstab. By aligning it with a different city, you instantly shift the time displayed to that location, connecting you to the pulse of a distant place.
The Sonnenuhr, crafted primarily from copper, weighs approximately 1000 kilograms and boasts a diameter of 3.6 meters. Its supporting bracket, however, is made of copper-plated steel. A copper structure alone wouldn’t be strong enough to bear the weight. The Sonnenuhr is the brainchild of engineer and clockmaker Lothar M. Loske, who designed it in the late 1940s. Constructed by the Vereinigten Deutschen Metallwerke, it took two years and 6000 working hours to build. The construction cost was 21,000 DM. The Sonnenuhr was a gift to the city of Frankfurt.
Originally located in the Nizza park, the Sonnenuhr was moved to its current location in 2004. Growing trees had begun to cast unwanted shadows on the dial. The move also allowed for the construction of a new restaurant. The relocation involved a 1.4-kilometer journey east and the installation of a new stone pedestal. A step, originally included to help shorter individuals reach the world time ring, was omitted in the move. The donation certificate, once housed within this step, now resides at the Institut für Stadtgeschichte, a silent witness to the Sonnenuhr’s journey through time. So next time you gaze upon the Sonnenuhr, remember, you’re not just looking at a clock. You’re looking at a story written in shadows, a story that connects us to the past and to the wider world. It’s a story that reminds us, time, like the shadows on the dial, is constantly shifting, constantly moving, and constantly revealing new secrets.