This clock is located in the Strasbourg Cathedral (Munster), which we visited in August 2021 as part of an included excursion on our Avalon Waterways river cruise. The current astronomical clock was built in 1843 and shares many of the features of its predecessors (dating back to the 14th century) such as an orrery, a rotating display of the current positions of the sun and moon, a planetary calendar, and even a mechanical rooster. We happen to be there at 12:30 pm (the solar noon of Strasbourg) and saw the bird crow and a conga line of apostles issued forth from the clock’s instruments, and passes before Christ. This daily event is very impressive, but can get very crowded. The calculations required to keep the accuracy of the earth and moon in rotation around the sun correctly on the clock is done by a complicated set of cogs on the right hand side of the planetary faceplate. A large celestial globe in front of the planetary clock is also connected to other mechanisms and the stars are in correct position for the day and time of year. A must see if you are visiting Strasbourg,, France.