Solar sundial made of Portuguese Limestone marble.

In the corners, 4 symbols linked to the celestial bodies are represented and specifically: an astrolabe, a representation of the inclination of the earth's axis with respect to its orbital plane which gives rise to the equinoxes and solstices, a compass rose and the zodiac symbols.

Each sundial must be designed and customized based on the geographical coordinates of the place and the declination of the wall on which it will be installed.