Gnomon
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A gnomon is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields.
The gnomon is the triangular blade in this sundial.
The gnomon projection on the floor of the Santa Maria del Fiore Cathedral during the solstice on 21 June 2012
Gnomon situated on the wall of a building facing Tiradentes Square, Curitiba, Brazil
Leonardo Ximenes
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Leonardo Ximenes was a famous Italian Jesuit, mathematician, engineer, astronomer and geographer from Sicily.
Terza memoria idrometrica, 1763