The back contains 10 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | The entire outer circle on the back of an astrolabe. |
| Cotangent | 0 - 40, 1/60 of quadrant radius | Every 5 | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
| Cotangent | 0 - 45, 1/60 of quadrant radius | Every 5 | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
| Declination | Gemini/Cancer - Sagittarius/Capricorn, Zodiacal divisions, equal or unequal | Not numbered | Arc | Upper right quadrant (inside circular scales) |
| Azimuth of Qibla | Cities | Not numbered | Arc | Upper right quadrant (inside circular scales) |
| Sine/Cosine | 1/60 of quadrant radius | Not numbered | Angle | Upper left quadrant (inside circular scales) |
| Shadow square | 0 - 7, Feet | Every 1 feet | Box | Left hand vertical 'face' of the shadow square (in LL) |
| Shadow square | 0 - 7, Feet | Every 1 feet | Box | Left hand bottom face of the shadow square (in LL) |
| Shadow square | 0 - 12, Fingers | Every 1 fingers | Box | Right hand bottom face of the shadow square (in LR) |
| Shadow square | 0 - 12, Fingers | Every 1 fingers | Box | Right hand vertical face of the shadow square (in LR) |
| Transcription | Translation | Notes | Type |
|---|---|---|---|
| راقمه فصل الله السبزواري | Composed by Faṣl Allah al-Sabzawārī | This inscription is found in the cartouche at the bottom of the instrument | Maker's signature |