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and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sextant.
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Most noteworthy among the instruments of the day was the astrolabe, a contraption containing movable disks to measure and represent the positions of astronomical objects.
If you ever wondered how astrolabes worked, down to the last detail, this is the book for you.
Mr. Brae, in the Appendix to his edition of Chaucer's Astrolabe (p. 101), has a long note on the present passage.
The Astrolabe had anchored in the same depth, and upon a similar bottom.
By this officer the following intelligence was brought back concerning the voyage of the Astrolabe and Boussole.
Astrolabe, an instrument formerly used for taking the altitude of the sun or stars, now superseded by the quadrant and sextant.
But a passage in the prologue to the Astrolabe leaves it without doubt that Chaucer was quite familiar with lunar phenomena.