What is a Gnomon?

The Babylonian instrument Gnomon is the part of a sundial that casts the shadow, and was a thin rod, or any object with a sharp tip or a straight edge.
  • Our Jantar Mantars which were built in 18th century by Maharaja Jai Singh II in 5 cities viz. in Delhi, Jaipur, Ujjain, Mathura and Varanasi are actually Huge Gnomons.

Today a 3D gnomon is commonly used in CAD and computer graphics. This 3D Gnomon aids to positioning objects in the virtual world. By convention, the X axis direction is colored red, the Y axis green and the Z axis blue.

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