Sundials - World's Oldest Clocks

North American Sundial Society

La Meridiana

This is the meridiana on the floor of St. Maria of the Angels in Rome, created in 1846 by Francesco Bianchini under Pope Clemente XI.

Cosmic Room in Corregidora

This is an unusual meridiana... a "cosmic room" to show beams of light forming a sundial and analemma on the wall and floor.  Equinoxes beam light through several rooms.

Solstice at Cathedral di Bari

Time lapse solstice observation at Cathedral di Bari