The Astronomical Observatories of Jai Singh c5.52
The Astronomical Observatories of Jai Singh c5.52
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c5.52
¹⁰ An astrolabe with two rings or parts. It is the triquetrum or regulae parallacticae. Al-Battāni calls it the 'long alhidade' (Nallino i. 321). In Leiden is a MS. De ratione qua ope instrumenti Zat al-Sho'batain, etc., by the celebrated al-Kindi. Muḥammad bin Isḥāq b. Abi 'Abbād, Abu'l Ḥasan also wrote on the same instrument (Suter, pp. 25 and 48).