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Goniometer
A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία (gōnía) 'angle' and μέτρον (métron) 'measure'.[1] The protractor is a commonly used type in the fields of mechanics, engineering, and geometry.
The first known description of a goniometer, based on the astrolabe, was by Gemma Frisius in 1538.
- ^ Spencer, Leonard James (1911). . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 12 (11th ed.). Cambridge University Press. p. 234.
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