gnomon

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gnomon

A gnomon is a device used to measure the passage of time by marking the solar shadow or light.

Traditionally a gnomon is a rod or vertical column at the center of a sundial, casting a shadow onto hour marks to keep time. However, its use varies greatly depending on the setting. In buildings like the cathedral in Modica, the gnomon consists of sophisticated markings on the floor, aligned to capture the passage of sunlight through specific openings on key events such as solstices and equinoxes. This setup marks precise times, providing essential calendrical and astronomical information, thus integrating celestial observation into a spiritual and communal framework.