The back contains 11 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 | None | Not numbered | Angle | Upper left quadrant (inside circular scales) |
Declination | None | Not numbered | Arc | Upper right quadrant (inside circular scales) |
Cotangent | Fingers | Every 5 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
Cotangent | Feet | Every 5 feet | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
Terms | Zodiacal divisions, equal or unequal | Inner Circular, concentric | half circle inside the outer circle (on mashriqi astrolabes) - covering LL and LR | |
Zodiacal signs | Zodiacal divisions, equal or unequal | Inner Circular, concentric | half circle inside the V circle (on mashriqi astrolabes) - covering LL and LR | |
Faces | Astrological face | Inner Circular, concentric | half circle inside the VI circle (on mashriqi astrolabes) - covering LL and LR | |
Lunar Mansions | Lunar mansion | Inner Circular, concentric | half circle inside the VII circle (on mashriqi astrolabes) - covering LL and LR | |
Shadow square | None | Box | None | |
Triplicities | Zodiacal divisions, equal or unequal | Inner Box | Box 'inside' the shadow square. Common site for triplicities, etc. |
Transcription | Translation | Notes | Type |
---|---|---|---|
العلي عبد صنعه | ‘Abd al-‘Ali made this | Maker's signature |