An instrument used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant.
- Lavanha also studied instruments used in navigation, constructing astrolabes, quadrants and compasses.
- Arab craftsmen produced complex astronomical instruments, astrolabes, which helped them plot the positions of the stars and tell the time of day.
- The construction of astronomical instruments such as the astrolabe was also a speciality of the Arabs.
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