Prague Calendarium

Prague Calendarium

When people see the Calendarium they think that they are looking at the Astronomical Clock. Actually the Clock is above it and was there first. The Calendarium was added around 80 years later. The first mention of the Calendarium is in 1490.

prague calendarium hand painted astrological graphics in concentric circles
Some Detail of the Prague Calendarium from 2018

What Does It Do?

Although it is far less technical than the clock it’s still a fascinating piece of equipment but this part is all about Astrology. When you look at the clock it is going to tell you 1) the name of a saint or important religious person associated with that day (Czechs used this to identify a person’s Namesday) and 2) The current astrological sign according to the Roman calendar.

prague calendarium in 2010
The Prague Calendarium in 2010 – largely the same since post WW2 repairs
prague calendarium in 2018. hand painted face with 12 large circles showing farming actions and inside them are 12 smaller circles showing astrological zodiac signs
The Prague Calendarium after the renovation – unveiled September 28th 2018

How Does The Calendarium Work?

The picture shows the detail of the Calendarium and you can see a few things.

1) the centre has castle turrets and a decoration around it. This part is fixed and the rest of what you see is a disc which rotates around this fixed point.
2) small circular pictures which depict the current zodiac sign.
3) larger circular pictures showing somebody performing an action.
4) a ring around the edge of the disc divided into daily parts with associated names.
5) a gold coloured pointer at the top of the disc (centre left in the first picture of the post).

So let’s take the day I took this picture. It was October 3rd 2018, a week after they formally unveiled the Old Town Hall building, Astronomical Clock and Calendarium after a 2-year renovation. So if you had looked up to the golden pointer you’ll see that the zodiac sign is Libra and the action sign above it corresponds to some task that should be performed in this period i.e. ploughing of land and sowing of crops to be harvested the following spring. At the top of the disc the golden pointer would be over that particular day and the name in the box is Bohumil. So in a Czech calendar this is Saint Bohumil’s day. And as a namesday, any man in the country called Bohumil would get a present from his friends i.e. usually a drink.

Tour Tips: Above the Calendarium is the Astronomical Clock. You can see into the rear of the mechanism where the apostles are turning if you go into the tower. I recommend two options below, one for the standard tower ticket and the other to add on the underground tour.

Interesting Stuff

There are two other things on the Calendarium that might interest you. First are the pictures i.e. the combination of the zodiac sign and an associated action is replicated at another location. You’ll see the same at Prague Castle, on the south side of St Vitus Cathedral, on the metal gates of the steps to the south entry but in this case they are plaques made of bronze.

Second is the plate in the centre of the Calendarium. The three towers over an open gate is the small version of the Prague city coat of arms. You would not believe it but there are less than a dozen visible plates in the Old Town which show this version. Every other plate, including all the manhole covers, show the same picture but this time with an arm and sword in the gate. So if you want to know why you’re going to have to read the Prague Coat of Arms Story.

Something Related or a Few Minutes Away

Attraction – How to Tell Time on the Astronomical Clock

Attraction – Prague Meridian

Attraction – Marian Column

Attraction – Old Town Square

Attraction – Idiom – Book Tunnel

Prague Streets – Little Square

Memorials – 1621 Memorial

Festivals – Czech Namesdays

Activities – Illusion Art Museum

Activities – Pragl Glass Shop

Food and Drink – Old Prague Ham

My Own Guided Tours – Cheaper Than You Think!

prague tour guide jason next to the vltava river
“Like being shown around by a knowledgeable friend” – Trip Advisor Review

Some Random Things to Do and See in Prague