<p style='text-align: justify;'>Recto: introduction to a treatise of Josiah b. Mevoraḵ al-ʿĀqūlī based on the idea that the Jewish calendar repeats itself exactly every 247 years. Verso: on the New Moons of Marḥešvan, Kislev and Ṭevet in defective, ordinary and full years.</p>