Definition of "gnomonics" [gno•mon•ics]

• The art of designing and constructing sundials (noun)

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• "The Temple or Tower of the Winds, has been very justly termed "the most curious existing monument of the practical gnomonics of antiquity.""
• "Before clocks were invented, people told the time by sun-dials, and there was a whole science of sun-dials, called gnomonics."
• "There he lived for fourteen years, engaged in mathematics and in physical experiments, and publishing his work on gnomonics and perspective."