Classifier Instance:

Anchor text: Abbas Ibn Firnas
Target Entity: Abbas_Ibn_Firnas
Preceding Context: Persian and Arab astronomers produced an improved version of the Greek armillary sphere in the 8th century, and wrote about it in the treatise of Dhat al-Halaq or The instrument with the rings by the Persian astronomer Fazari (d.c. 777).
Succeeding Context: (d.887) is thought to have produced another instrument with rings (armillary sphere) in 9th century which he gifted to Caliph Muhammad I (ruled 852-886). The spherical astrolabe, a variation of both the astrolabe and the armillary sphere, was invented during the Middle Ages in the Islamic world. The earliest description of the spherical astrolabe dates back to the Persian astronomer Nayrizi (fl. 892-902). Muslim astronomers also independently invented the celestial globe, which were used primarily for solving problems in celestial astronomy. Today, 126 such instruments remain worldwide, the oldest from the 11th century. The altitude of the sun, or the Right Ascension and Declination of stars could be calculated with these by inputting the location of the observer on the meridian ring of the globe.
Paragraph Title: Medieval Islamic world and Europe
Source Page: Armillary sphere

Ground Truth Types:

Predicted Types:

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