Word of the Day
April 06, 2026
ASTROLABE
- .
- a compact instrument used to observe and calculate the position of celestial bodies before the invention of the sextant [n -S]
- a medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies [n ASTROLABES]
- astronomical instrument for taking the altitude of the sun or stars and for the solution of other problems in astronomy and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sext
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