[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [The Astronomical Observatories of Jai Singh](https://indike.org/pramana/ins.science.kaye-1918) › c5.7 # The Astronomical Observatories of Jai Singh c5.7 The Astronomical Observatories of Jai Singh c5.7 - **Language:** English ### [c5.7](https://indike.org/pramana/ins.science.kaye-1918.c5.7) Two pages of the Jaipur manuscripts are shown in Plate I (Figures 1, 2), and I give below extracts⁴ from the manuscripts together with a table of comparisons. The manuscript gives: (\*a\*) The numbers of the constellations and star numbers, and these in all cases follow Ulugh Beg's order exactly. (\*b\*) The nomenclature, which is a translation from Ptolemy (through Ulugh Beg). In a few cases the Persian and Hindu names are also given. (\*c\*) Ulugh Beg's longitudes with 4°8' added for precession. (\*d\*) The latitude which in practically all cases is the same as Ulugh Beg's. (\*e\*) The so-called polar longitudes⁵ (what Delambre calls ‘false longitudes’); this is the \*Sūrya Siddhānta\* method of indicating the positions of stars, but it also occurs in Muslim works, e.g., Abū ‘Alī al-Ḥasan in the 13th century of our era calculates the polar longitudes for a number of stars; and the presence of these polar longitudes in Jai Singh's catalogue is possibly due to Muslim and not Hindu influence. (\*f\*) Declinations, and (\*g\*) Right ascensions apparently read off from a globe. (\*h\*) Right ascension in \*ghaṭis\* and \*palas\* obtained from (\*g\*) by dividing by six.⁶ (\*h\*) Star magnitudes which seldom differ from those recorded by Ulugh Beg. - [Previous: c5.6](https://indike.org/pramana/ins.science.kaye-1918.c5.6) - [Next: c5.8](https://indike.org/pramana/ins.science.kaye-1918.c5.8) - [Up: c5](https://indike.org/pramana/ins.science.kaye-1918.c5) ## Cites (1) - [Sūryasiddhānta](https://indike.org/pramana/in.astro.siddhanta.early.suryasiddhanta) — Maya, Sanskrit --- Source: [https://indike.org/pramana/ins.science.kaye-1918.c5.7](https://indike.org/pramana/ins.science.kaye-1918.c5.7) · Pramāṇa