Megalithic sundial in the Black Forest?

Close to a church near the Schluchsee lake in the Upper Black Forest, on a hill, there is a presumably megalithic construction which may be a sundial or the basis for one. An upright monolith weighing several tonnes, supported by two granite "wedges" - in front of it a rock structure with a carved "clock face" that looks as if it is slanting or almost lying down.

The "numerals" on the millstone-like surface of the sloping rock or corresponding markings are not (or no longer?) present today - the entire "table surface" is aligned with the standing rock in front of it.

Esoterics or New Agers obviously regularly organise their own ceremonies here. Quite frankly, I don't really agree with the common opinion that this is a sacrificial table or a millstone production centre.

I'm not entirely sure what we're dealing with here, but I would venture to speculate. Some say that there is an incomplete millstone production area here - personally, I am thinking more of other uses that are more ceremonial or metrological in nature. Especially in view of the overall constellation of the two granite blocks, which were undoubtedly worked by man. In this respect, I tend to agree with the basic idea of a sundial or a "measuring station" (for whatever purpose - sun, astronomy).

Rear and side granite supports for the "reference rock". If the rock was already in place, it must have taken some effort to erect this colossus of tonnes.

Both rocks were certainly not "placed" where they are today using modern construction machinery - even in an assumed time of origin in the Middle Ages, this would have been really sporty with ox carts. Assuming the rocks had already been there and they had merely been "moved", the site would have been rather impractical for millstone production. As far as I know, millstones were produced directly at quarries or more spacious extraction sites and less at such exposed points.

Side view of the reference rock to the sundial. The right-hand front side appears to be at an almost 90-degree angle with the help of the supports.

We are still left guessing here. It cannot be ruled out that destructive forces have already been at work here. Either the work was never completed or its true purpose has been made unrecognisable. See for yourself.

A little further upstream (in front of the millstone-like slab) there is another worked rock. Whether the traces of carving are from more recent times is also questionable.