The Astronomical Observatories of Jai Singh c5.85

c5.85

² There are some points about the preface that are not quite consistent with each other and known facts. The tradition is that the Zij Muḥammad Shāhī was completed in A.D. 1728 and this is, to some extent, confirmed by the Jaipur MS.; the preface was written some time after all the observatories had been built, that is after 1734, and "more than 300 years" after (the death of) Ulugh Beg [Ulugh Beg died in A.H. 853, and 853+300=1153 A.H.=A.D. 1740-1]. The legitimate conclusion is that the preface was written some considerable time after the tables had been completed.