| Another special type of telescopic instrument is the modern version of the astrolabe. |
| He is famed as the first person to write a Sanskrit treatise on the astrolabe. |
| Unlike the delicate quadrant, the mariner's astrolabe was a thick, weighty instrument typically made of cast bronze or brass. |
| Because of such features, the planispheric astrolabe can be regarded as a kind of rudimentary analogue computer. |
| The place of manufacture, which is incised together with the name of the craftsman on the back of the astrolabe, is given as Alcalá. |
| The construction of astronomical instruments such as the astrolabe was also a speciality of the Arabs. |
