This sundial consists of a globe on a tripod stand decorated with geometrical motifs.
The globe is set up with the hour ring in the plane of the equator. When in use, the globe is put with the 6 to VI diameter in the plane of the meridian. As the sun shines on the globe, one half is always in the shadow, and the edge of the shadow, as it moves round the hour ring, gives the time.
If the globe is turned on its axis so that the 12 to XII diameter is in the meridian, the shadow of the gnomon at noon gives the sun's declination.