Sundial of the month December

In the garden of the Huize van Loon Museum in Amsterdam, Keizersgracht 672, a stone polyhedron sundial dates back from 1578.
On it are no less than 22 sundials, a considerable number being hollow cylinder dials.
The whole is decorated with a ball, which was not made into a sundial, although it easily could have been.

Initially this sundial was in the garden of the Stania estate in Oenkerk, Friesland, as mentioned in the 1950 Terpstra book. The picture below is taken from that book.
It shows the cylindrical East dial, and points out another characteristic.

In the upper left of the East face, a butterfly-shaped cross is visible, and in the lower right a circular scale with the signs of the Zodiac still recognisable.
At true noon the shadow of a pencil or the like, held at right angles to the centre of the cross, reads the date on the circular scale. The West side of this sundial is done in the same fashion.

Fer de Vries