gnomon

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gnomon

(nō`mŏn): see sundialsundial,
instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall.
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gnomon

(noh -mon) A device used in ancient times to measure the altitude of the Sun and hence to determine the time of day and time of year. It consisted of a vertical shaft of known height (such as an upright rod or pillar) that cast a shadow of measurable length and direction on a graduated horizontal base. The ratio of height to shadow length gave the tangent of the altitude angle. The term is also applied to the metal projection on a sundial, used for the same purpose.

Gnomon

 

an ancient astronomical instrument consisting of a vertical column on a horizontal platform. The altitude and azimuth of the sun can be determined from the length and direction of the column’s shadow. The shortest shadow during the day indicates the direction of the north line. In ancient times the gnomon was used to determine the inclination of the ecliptic to the equator and the geographical latitude of locations. In modern times the gnomon finds use only as a sundial.

gnomon

[′nō·mən]
(engineering)
On a sundial, the inclined plate or pin that casts a shadow. Also known as style.
(mathematics)
A geometric figure formed by removing from a parallelogram a similar parallelogram that contains one of its corners.
References in periodicals archive ?
An Indian circle is a circle drawn on the ground, of an arbitrary radius, at the center of which a gnomon is installed.
Zum antiken astro-geodatischen Messinstrument Skiotherikos Gnomon," Zeitschrift far Vermessungswesen 130.
We'll need to do some counting similarly to the triangular numbers but with a pentagonal grid of dots and develop a table of values that correspond to each "level" of number similar to the last edition of Diversions and identify the gnomon sequence.
In the Square, successive gnomons were 3, 5, 7, 9, 11, 13, 15.
Explanation could refer to differences increasing by one each time so the gnomons are the counting numbers 2, 3, 4, 5, 6, 7, 8 (revisiting this next issue).
In Imperial China the emperor's astronomers determined the date of the winter solstice and length of the year with respectable precision by measuring the noon shadow of a gnomon.
If you already have a tower, you don't need another gnomon.
The first Stan Winston School lessons will be available January 2011, in both DVD and online streaming formats, in association with Gnomon School of Visual Effects.
Thanks to the expertise of our partners at Gnomon School of Visual Effects, the Stan Winston School will be at the vanguard of visual arts education.
LOS ANGELES -- Gnomon School of Visual Effects, the industry leader in professional training for artists in the entertainment and design field, today revealed that it has established Gnomon Studios, where advanced Gnomon students prepare for professional careers by working on short films in a studio environment under the guidance and mentorship of production professionals.
While Gnomon students participate in group projects through their lab work, those projects don't necessarily reflect the real-world structure and workflow of a visual effects studio," said Alex Alvarez, founder and director of Gnomon School of Visual Effects.
The Gnomon School has long been recognized as a leading institution for advanced training within the digital entertainment industry, and we are now proud to expand access to Gnomon though the new Entertainment Design and Digital Production program," said Alex Alvarez, Founder of Gnomon School of Visual Effects.