Zīd̲j̲

, in Islamic science an astronomical handbook with tables, after the models of the Sāsānid Persian Zīk -i S̲h̲ahriyār, the Indian Sindhind [q.v.], and Ptolemy’s Almagest and Handy Tables [see baṭlamiyūs]. A typical zīd̲j̲ might contain a hundred folios of text and tables, though some are substantially larger than this. Most of the relevant astr…