"As often as you hear the ringing bell, do not forget to praise and thank your God, who rules over all the stars."
The clock in the Chapel of the Dance of Death is a replica of the clock that burned in March 1942. The facade is divided into three sections: at the bottom, the calendar disc; in the middle, the planetarium with the zodiac, sun, and moon showing the phases of the moon; and above this, the procession of figures representing eight peoples of the world.
If you're in the church at noon, you can watch the procession: the eight figures emerge one after the other from the dark door on the left, are blessed by Jesus—in a red cloak—and disappear through the brightly lit door on the right.
Incidentally, the astronomical clock is preset until the year 2080. So you can already check which day your next milestone birthday will fall on.