Quadrant (instrument) - Wikipedia
WEBA quadrant is an instrument used to measure angles up to 90°. Learn about its history, types and applications in astronomy, navigation and surveying.
Octant (instrument) - Wikipedia
WEBThe octant, also called a reflecting quadrant, is a reflecting instrument used in navigation. Etymology. The name octant derives from the Latin octans meaning eighth part of a circle, because the instrument's arc is one eighth of a circle.
Starry Messenger: The Quadrant and Sextant - University of …
WEBAn astronomical quadrant is essentially a graduated quarter of a circle, set up to measure the altitude of celestial objects above the horizon. The graduations from 0 - 90° are on the circumference, or limb of the instrument, over which usually a sight or index arm moves.
Navigational Instruments - Celestial Navigation
WEBQUADRANT. This instrument, shaped like a quarter of a circle, measured the angle from the vertical – not horizontal – and the line of sight to the body. It was suspended from a ring and had a weighted line hanging down, which crossed one …
Epact: Scientific Instruments of Medieval and Renaissance Europe
WEBQuadrant. A quadrant is a mathematical or an astronomical instrument featuring a graduated arc encompassing a quarter of a full circle or 90?. Astronomical quadrants were used mainly for determining the altitude of a celestial body above the horizon.
Meridian circle - Wikipedia
WEBThe meridian circle is an instrument for timing of the passage of stars across the local meridian, an event known as a culmination, while at the same time measuring their angular distance from the nadir.
Sextant vs. Quadrant: What’s the Difference?
WEBSep 28, 2023 · A sextant is a navigational instrument measuring angular distances, while a quadrant is both a quarter of a circle and an instrument measuring altitudes in navigation or astronomy.
Quadrant - SpringerLink
WEBThe quadrant is an instrument which was used for measuring angles and for making astronomical calculations. Apart from those for the accurate observation of altitude, known to us almost entirely from written descriptions, the quadrants of …
quadrant - daviddarling.info
WEBIn spherical geometry, a quadrant is a spherical distance π/2. A quadrant of a circle is a sector with a central angle of π/2. In astronomy, a quadrant is an old instrument, based on a quarter of a circle and designed to measure the altitude above the horizon of …
Quadrant (instrument) - Infogalactic: the planetary knowledge core
WEBA quadrant is an instrument that is used to measure angles up to 90°. It was originally proposed by Ptolemy as a better kind of astrolabe. Several different variations of the instrument were later produced by medieval Muslim astronomers.
- Some results have been removed
Skip to content