| LC control no. | sh 85109410 |
|---|---|
| LC classification | QB105 Astronomy VK583 Navigation |
| Topical heading | Quadrants (Astronomical instruments) |
| Variant(s) | Quadrant |
| See also | Astronomical instruments Nautical instruments |
| Found in | Mitlon, J. Cambridge dict. of astron. (quadrant: an instrument for measuring the altitudes of stars and the angular separation between celestial objects consisting of a graduated quarter-circle and a movable sighting arm. Prior to the invention of the telescope, such instruments were the only ones available to astronomers for positional measurements) |
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