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'. The protractor is a commonly used type in the fields of mechanics, engineering, and geometry.

For other uses, see Goniometer (disambiguation).

The first known description of a goniometer, based on the astrolabe, was by Gemma Frisius in 1538.

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