The back contains 15 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 | 1/60 of quadrant radius | Not numbered | Angle | Upper left quadrant (inside circular scales) |
Declination | Summer solstice - Winter solstice, 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) |
Shadow square | 1 - 7, Feet | Every 1 feet | Box | Left hand vertical 'face' of the shadow square (in LL) |
Shadow square | 1 - 12, Fingers | Every 3 fingers | Box | Right hand vertical face of the shadow square (in LR) |
Cotangent | 0 - 35, Feet | Every 5 feet | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
Cotangent | 0 - 42, Fingers | Every 6 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
Triplicities | Planet | Inner Box | Box 'inside' the shadow square. Common site for triplicities, etc. | |
Zodiacal signs | Aries - Pisces, Zodiacal sign | Inner Circular, concentric | half circle inside the outer circle (on mashriqi astrolabes) - covering LL and LR | |
Lunar Mansions | 0° Aries - 30° Pisces, Lunar mansion | Inner Circular, concentric | half circle inside the V circle (on mashriqi astrolabes) - covering LL and LR | |
Faces | 0° Aries - 30° Pisces, Zodiacal divisions, equal or unequal | Inner Circular, concentric | half circle inside the VI circle (on mashriqi astrolabes) - covering LL and LR | |
Decans | 0° Aries - 30° Pisces, Zodiacal divisions, equal or unequal | Inner Circular, concentric | half circle inside the VII circle (on mashriqi astrolabes) - covering LL and LR | |
Shadow square | 0 - 12, Fingers | Every 3 fingers | Box | Right hand bottom face of the shadow square (in LR) |
Shadow square | 0 - 7, Feet | Every 1 feet | Box | Left hand bottom face of the shadow square (in LL) |
Transcription | Translation | Notes | Type |
---|---|---|---|
صنعت قاسم على قائني ١٠٩٣ | Qāsim ‘Alī Qā’inī made this, A.H. 1093 | Maker's signature | |
[inscription in upper right quadrant, just above the central hole] | [ pending ] | None |