Gnomonic

Part of speech: adjective

Pronunciation: /nəʊˈmɒnɪk/

Definitions

1. Relating to the art of placing a gnomon on a sundial, this term also describes a projection that preserves angles between lines and may refer to diagrams showing such relationships in geometry
2. The word refers to a type of projection that maintains the angles of intersecting lines, often associated with the use of a gnomon in sundials and geometrical illustrations
3. It encompasses the concept of angle-preserving projections within geometrical contexts, specifically linked to sundial techniques utilizing a gnomon for time measurement

Etymology: "Gnomonic" comes from Ancient Greek "gnōmonikós," meaning "judging by rule" or "skilled at judging," a sense that has little to do with clocks. The Greek root is "gnōmōn," which originally meant someone who knows or decides, such as an interpreter or judge. From that sense the word came to mean the pointer or upright stick of a sundial, which "judges" the time by the shadow it casts, and later the carpenter's square and the sundial's shadow-casting part more generally. The adjective passed into Latin as "gnōmonicus" and from there into English, where it describes anything relating to sundials or to the art of designing them. A gnomonic projection, a map method in which straight lines run as great circles, is a separate technical use that comes from the same idea of a shadow cast from a central point. The English word is a learned borrowing, so its meaning stays close to its classical sources rather than drifting through everyday speech.

Synonyms: geometric, mathematical