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. |

Declination | Gemini/Cancer - Sagittarius/Capricorn, Zodiacal divisions, equal or unequal | Not numbered | Arc | Upper right quadrant (inside circular scales) |

Azimuth of Qibla | Cities | Arc | Upper right quadrant (inside circular scales) | |

Sine/Cosine | 1/60 of quadrant radius | Not numbered | Angle | Upper left quadrant (inside circular scales) |

Cotangent | 0 - 45, Fingers | Every 5 fingers | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |

Cotangent | 0 - 25, Feet | Every 5 feet | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |

Zodiacal signs | Aries - Pisces, Zodiacal sign | Not numbered | Inner Circular, concentric | half circle inside the outer circle (on mashriqi astrolabes) - covering LL and LR |

Terms | 0° Aries - 30° Pisces, Zodiacal divisions, equal or unequal | At each term | 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 numbered | Inner Circular, concentric | half circle inside the VII circle (on mashriqi astrolabes) - covering LL and LR |

Faces | 0° Aries - 30° Pisces, Astrological face | Not numbered | 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 | Left hand vertical 'face' of the shadow square (in LL) |

Shadow square | 0 - 12, Fingers | Every 3 fingers | Box | Left hand bottom face of the shadow square (in LL) |

Shadow square | 0 - 7, Feet | Every 1 feet | Box | Right hand bottom face of the shadow square (in LR) |

Shadow square | 0 - 7, Feet | Every 1 feet | Box | Right hand vertical face of the shadow square (in LR) |

Triplicities | Zodiacal divisions, equal or unequal | Inner Box | Box 'inside' the shadow square. Common site for triplicities, etc. |