This unusual sundial, where the string gnomon is supported by a silver figure, tells the time in planetary as well as ordinary hours, and has an elaborate zodiacal scale. There are also two volvelles which relate to astrology, one of which reveals which planet rules each of these planetary hours for each day of the week.
There is a great deal of lively decoration, including representations of the signs of the zodiac and allegorical representations of the sun and moon.
