WITNESS

Maʿrifah ʿarḍ al-balad_Istanbul_Süleymaniye Manuscript Library_Ayasofya_4830

References

Charette, François, and Petra Schmidl. 2004. “Al-Khwārizmī And Practical Astronomy In Ninth-Century Baghdad, The Earliest Extant Corpus Of Texts In Arabic On The Astrolabe And Other Portable Instruments”. Sciamvs 5: 101-98.

P. 108.