Although the apparent simplicity of its construction obscures the fact at first, a sundial is not a timepiece (Clock) but an astronomical instrument that uses the position of the sun (Sun and Moon) to calculate the geographical latitude of a place as well as to indicate noon (apex of the sun’s motion), the time of day and the season as a function of the sun’s declination, the equinoxes, the solstices, and the ecliptic. Its design was determined by knowledge of astronomy along with art…