Passion for astronomy leads to investigating the measurement and nature of time, sundials born since man first learned to use a stick and its shadow to get an idea of its passing are fascinating in their apparent simplicity.
Behind this apparent triviality lie complicated calculations that increase their value to those who know how complex measuring instruments really are, but for everyone even in the age of digital time the fascination of "solar" time remains intact.

From astronomy to gnomonics the road is short, that's why I drew some, either to learn a new and fascinating thing, or for multidisciplinary dabbling, in fact you have to master and do a little bit of everything to build one according to the rules of calculation, not to mention the pictorial part that enriches a well-made instrument.
I have painted a number of them, most of them on rigid supports so that they are removable, they served as training and learning, in fact some are definitely pictorial/practical "exercises," only one ended up on my neighbor's wall when I began to master the art of creation at a decent level.
Some tricks need to be learned, from the treatment of the wall that will receive the sundial, to the use of the "lignee" of the old painters (the string soaked in dye to pull the lines straight, the luck of having an old painter relative close to home means).

Unfortunately, bureaucracy always gets in the way and manages to annoy even this kind of activity, it takes permits projects, pictures, if you follow all the rigmarole you risk losing the pleasure of having a sundial on your wall.
However, I hope that the number of sundials on the walls will increase in the coming years, I always have a few projects, of course stopped due to lack of time, and a few requests that I do not have time to fulfill (yes they ask me to draw new ones, but time is short!).

A minimum of painting skills must be learned, even if you are good at calculating the structure of the sundial, eventually you will have to lean on a really capable painter, otherwise the result will be disappointing and even if accurate, it will not be much appreciated, if not reduced to the bare essentials. But a painter remains a painter and a technician a technician; I am the latter.

Eventually I became a decent gnonomist and doodle four lines in a cross on a background (but artfully using li lignee from old painters), there is much room to grow further, good thing a passion not exhausted.
Here are my experiments from the first decidedly mundane to the most recent, time permitting I will probably do more.