Reading the Simplicity

Reading the calendario cent’anni by ochs und junior

cca II

Try the Calendario cent’anni for yourself.


The two arrows on the right side of the cca allow you to play with different dates. Reading Ludwig Oechslin’s hundred year calendar becomes intuitive after a very short time on the wrist.

1. Reading the date The 30 + 1 rectangles around the perimeter of the dial display the date. The white 10 minute marker serves as reference points. For example the yellow rectangle points to 4 o’clock white marker it is the 10st day of the month (20 ÷ 2 = 10). Other example, yellow rectangle points 6 o’clock it is the 15st day (30 ÷ 2 = 15).

2. Reading the months The white point on the center disk indicates the month and also the leap year. When the white dot is at 1 o’clock, it’s January. When the white dot marks 6 o’clock, it’s July. And when the white dot marks 12 o’clock, it is December. The month disk rotates clockwise.

3. Reading the Leap and common years The month disk includes a smaller disk with a white marker showing the leap year if pointing to the white dot. The marker rotates clockwise at 90° showing the three common years. The leap year disc rotates clockwise with the month disc.