Astrolaab ehk tähesihik oli iidne astronoomiline mõõtevahend, mida kasutati taevakehade kõrguse mõõtmiseks, kohaliku aja, laiuskraadi ning kalendriarvutuste tegemiseks.
The astrolabe was an ancient astronomical measuring instrument used to measure the altitude of celestial bodies and to determine local time, latitude, and calendar calculations.
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