Epistola Solis ad Lunam Crescentem by Muhammad ibn Umail al-Sadiq al-Tamimi, 1478

The Epistola Solis ad Lunam Crescentem (Risālat ash-Shams ilā al-Hilâl in Arabic, 'The Letter of the Sun to the Crescent Moon') is an alchemical poem written by Muhammad ibn Umail al-Sadiq al-Tamimi (c. 900-960). Little is known about the author, a part from the fact that he wrote several alchemic books in Arabic. In the manuscripts containing the translations of his works in Latin, his name appears in different adaptations, often as 'Senior Zadith Filius Hamuel'. The name of the author is not indicated in this manuscript.

The texts starts on f. 50r and it is introduced by the rubric Incipit epistola solis ad lunam crescentem. It begins with the words [E]pistola solis ad lunam crescentem quando incipit in subtilitate et in tenuitate sua nimia dabo tibi de pulchritudine mea. It ends on f. 53v with the words et quom nihil in eo remanserit tunc abluisti corpus a sordibus suis. Amen; it is followed by the rubric Epistola solis ad lunam crescentem explicit deus laus.