Thesaurus Term/Concept: OCTANT

Identifier	143020
Class	MDA OBJECT TYPE
Status	Preferred
Index?	Yes
Scope Note	An astonomical instrument, and navigational aid, in the form of one eighth of a circle and used to measure the angular altitude of heavenly bodies. Invented in 1731 and used into the 19th Century, it was superceded by the sextant.

Broader Terms/Concepts (1)