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What (who) is Gnomon - definition
THE PART OF A SUNDIAL THAT CASTS A SHADOW
Gnomonist; Nomon
![Gnomon situated on the wall of a building facing Tiradentes Square, [[Curitiba]], Brazil](https://commons.wikimedia.org/wiki/Special:FilePath/Gnomon normalized.jpg?width=200 "Gnomon situated on the wall of a building facing Tiradentes Square, [[Curitiba]], Brazil")
gnomon
['n??m?n]
¦ noun
1. the projecting piece on a sundial that shows the time by its shadow.
2. Geometry the part of a parallelogram left when a similar parallelogram has been taken from its corner.
3. Astronomy a structure used in observing the sun's meridian altitude.
Derivatives
gnomonic -'m?n?k adjective
Origin
C16: via L. from Gk gnomon 'indicator, carpenter's square'.
gnomon
n.
Style (of a dial).
Gnomon
·noun The index of the hour circle of a globe.
II. Gnomon ·noun The style or pin, which by its shadow, shows the hour of the day. It is usually set parallel to the earth's axis.
III. Gnomon ·noun A style or column erected perpendicularly to the horizon, formerly used in astronomocal observations. Its principal use was to find the altitude of the sun by measuring the length of its shadow.
IV. Gnomon ·noun The space included between the boundary lines of two similar parallelograms, the one within the other, with an angle in common; as, the gnomon bcdefg of the parallelograms ac and af. The parallelogram bf is the complement of the parallelogram df.
Wikipedia
Gnomon
A gnomon (; from Ancient Greek γνώμων (gnṓmōn) 'one that knows or examines') is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields.
Examples of use of Gnomon
1. I sat and watched the sun set, the minaret casting its long shadow, like a gnomon defining a sacred precinct.