This is a quickie, just a graphics project to pull my mind through the recent hot spell.
The Exeter Cathedral clock was built in the 1300s and remodeled around 1890. It’s a geocentric orrery with a 24-hour dial, numbered as two sequences of 12.
It’s not a freestanding clock. I’ve mounted it on a flat board inside an arch, similar to the original.
The 12+12 hours dial doesn’t rotate; instead the sun acts as the hour hand. The 30-day month dial rotates with the earth and moon. It’s not clear how the 30-day period was synced with the 27.3 day actual lunar cycle; perhaps the operators just manually reset it at every new moon.
PEREUNT ET IMPUTANTUR refers to the hours. The hours perish, and the hours are charged to your account in heaven. Buy your Indulgences now! Beat the rush!
The minutes dial was tacked on in 1890 as part of the rebuilding.
Polistra's Mill 