Definition of gnomon in English:
1The projecting piece on a sundial that shows the time by the position of its shadow.
- The problem is that the gardeners have been caught on the gnomon of their own sundial.
- He also probably introduced the gnomon (a perpendicular sun-dial) into Greece and erected one in Sparta.
- He placed a pole perfectly upright in the ground to make a simple sundial, or gnomon.
1.1 Astronomy A structure, especially a column, used in observing the sun’s meridian altitude.
- The simplest astronomical instruments was the gnomon, nothing other than a stick which was erected and the length of its shadow measured.
- He is also said to have constructed a armillary sphere, a water clock, and a bronze gnomon, a pointer whose shadow gives the time of mid-day.
- Pergolas, open steel stairs, lattices and wooden blinds all act as shadow-casters and gnomons.
2 Geometry The part of a parallelogram left when a similar parallelogram has been taken from its corner.
- Revolve the gnomon about its vertex and it can draw a circle; combine two gnomons and they form a square.
- When the gnomon is turned up, it can measure height; when it is turned over, it can measure depth and when it lies horizontally it can measure distance.
- Example sentences
- Loxodromes appear as straight lines on the Mercator projection, while orthodromes appear as straight lines on the gnomonic projection.
- The videos were projected onto two screens built to replicate the gnomonic and ‘Robinson projections’ of representing the globe on a two dimensional surface.
- A gnomonic image, meanwhile, tends to make the surface appear flat, and is used by navigators and aviators in determining the shortest distance between two points.
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