The Astronomical Observatories of Jai Singh c19.s4.2
The Astronomical Observatories of Jai Singh c19.s4.2
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c19.s4.2
¹ Flamsteed had been at work at Greenwich for four years, when the Zarqālī instrument was made. The instrument is dated A.D. 1680, and Flamsteed's catalogue is for 1689.