astrolabe

American  

[as-truh-leyb] / ˈæs trəˌleɪb /

noun

1. an 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and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sextant.

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astrolabe British  

/ ˈæstrəˌleɪb /

noun

1. an instrument used by early astronomers to measure the altitude of stars and planets and also as a navigational aid. It consists of a graduated circular disc with a movable sighting device Compare sextant

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astrolabe Scientific  

/ ăs′trə-lāb′ /

1. An ancient instrument used widely in medieval times by navigators and astronomers to determine latitude, longitude, and time of day. The device employed a disk with 360 degrees marked on its circumference. Users took readings from an indicator that pivoted around the center of the suspended device like the hand of a clock. The astrolabe was replaced by the sextant in the 18th century.

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Other Word Forms

• astrolabical adjective

Etymology

Origin of astrolabe

1325–75; Middle English, variant of astrolabie < Medieval Latin astrolabium < Late Greek astrolábion, Greek astrolábon (neuter of astrolábos, adj. used as noun), equivalent to ástro ( n ) star + lab- (variant stem of lambánein to take, seize) + -on neuter suffix

Example Sentences

Whether steering a ship for commercial trade or finding the direction of Mecca for purposes of prayer, an astrolabe harnessed light to manage desires around science and myth.

From Los Angeles Times • Nov. 22, 2024

A series of Hebrew additions led Dr. Gigante to conclude that the astrolabe had eventually reached the Jewish diaspora in Italy, where Hebrew, rather than Arabic, was used.

From New York Times • Mar. 12, 2024

Destined for an exhibit in Madrid, the painting was whisked through the Dutch halls, past Johannes Vermeer’s Astronomer studying an astrolabe, before getting stuck in front of a small doorway in the Rubens room.

From Seattle Times • Jan. 26, 2021

It was a seafaring culture: they perfected navigational skills without needing instruments like the astrolabe used by the Arabs.

From BBC • Dec. 3, 2020

Monks discovered that the astrolabe, an Arabic invention, was a handy tool for keeping track of time in the evening, helping them keep their prayers on schedule.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife