The back contains 9 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 | Upper right quadrant of outer circular on back of instrument. |
Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
Sine/Cosine | 0 - 60, 1/60 of quadrant radius | Not numberered | Angle | Upper left quadrant (inside circular scales) |
Shadow square | None | Not numberered | Box | Upper right quadrant (inside circular scales) |
Terms | None | Not numberered | Inner Box | Upper right quadrant (inside circular scales) |
Cotangent | 0 - 45, None | Every 5 | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
Cotangent | 0 - 30, None | Every 5 | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
Zodiacal signs | Aries - Pisces, Zodiacal divisions, equal or unequal | Not numberered | Inner Circular, concentric | half circle inside the outer circle (on mashriqi astrolabes) - covering LL and LR |
Faces | 0° Aries - 30° Pisces, Astrological face | Not numberered | Inner Circular, concentric | half circle inside the V circle (on mashriqi astrolabes) - covering LL and LR |
Lunar Mansions | 0° Aries - 30° Pisces, Lunar mansion | Not numberered | Inner Circular, concentric | half circle inside the VI circle (on mashriqi astrolabes) - covering LL and LR |
Transcription | Translation | Notes | Type |
---|---|---|---|
في سعد الهجري ذنل | In good fortune, 751 Hijra | The date on this could be 711 | Miscellaneous |