An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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spherical astrolabe
  اسطرلاب ِ سپهری، ~ کره‌ای  
ostorlâb-e sepehri, ~ kore-yi
Fr.: astrolabe sphérique  

A type of → astrolabe in which the observer’s horizon is drawn on the surface of a globe, mounted with a freely rotating spherical lattice work or ‘spider’ representing the celestial sphere. The earliest description of the spherical astrolabe dates back to  the Iranian astronomer Nayrizi (865-922).

See also: → spherical; → astrolabe.