The back contains 7 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Degree | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | outermost scale on the front of the limb |
| Lunar Mansions | 0° Aries - 30° Pisces, Lunar mansion | Not numbered | Circular, concentric | Circular scale immediately inside the outer scale - refers to the full circle |
| Zodiacal signs | 0 - 30, Zodiacal divisions, equal or unequal | Every 5 | Circular, concentric | Circular scale second in from the outer scale - refers to the full circle. |
| Calendar | Days of year | Every 5 days days | Circular, concentric | Circular scale third in from the outer scale - refers to the full circle. |
| Perpetual calendar | None | Circular, concentric | Upper left quadrant (inside circular scales) | |
| Perpetual calendar | None | Circular, concentric | Upper right quadrant (inside circular scales) | |
| Perpetual calendar | None | Circular, concentric | Lower left quadrant | |
| Shadow square | 1 - 12, Fingers | Every 2 fingers | Box | Right hand bottom face of the shadow square (in LR) |
| Shadow square | 1 - 12, Fingers | Every 2 fingers | Box | Right hand vertical face of the shadow square (in LR) |
| Transcription | Translation | Notes | Type |
|---|---|---|---|
| مما أحكم صنعته محمد بن سعيد الصبان في مدينة الفرج حرسها الله في سنة تعد الهجرية | Among the objects skilfully made by Muḥammad ibn Saʿīd as-Ṣabbān in Guadalajara (Madīnat al-Faraj) in A.H. 474. | Maker's signature |