"Treatise on the Astrolabe," a Seljuk-illustrated Arabic manuscript in naskh script, copied by Mahmud bin Muhammad al Mushi, Sivas, Turkey, dated 1231. This is one of the earliest known extant copies of the treatise, originally by Abu Rayhan Muhammad Bin

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"Treatise on the Astrolabe," a Seljuk-illustrated Arabic manuscript in naskh script, copied by Mahmud bin Muhammad al Mushi, Sivas, Turkey, dated 1231. This is one of the earliest known extant copies of the treatise, originally by Abu Rayhan Muhammad Bin Ahmad Al-Biruni (973-circa 1050), bound with three other treatises on the construction, use and theory of the astrolabe, dated 1231, 1238 and circa 1238.

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