[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) › c9.7 # The Astronomical Observatories of Jai Singh c9.7 The Astronomical Observatories of Jai Singh c9.7 - **Language:** English ### [c9.7](https://indike.org/pramana/ins.science.kaye-1918.c9.7) 28. The Samrāṭ Yantra or ‘Supreme instrument’¹ is, as its name implies, the most important. It is an equinoctial dial, consisting of a triangular gnomon with the hypotenuse parallel to the earth’s axis, and on either side of the gnomon is a quadrant of a circle parallel to the plane of the equator. It is, in principle, one of the simplest ‘equal hour’ sundials. - [Previous: c9.6](https://indike.org/pramana/ins.science.kaye-1918.c9.6) - [Next: c9.8](https://indike.org/pramana/ins.science.kaye-1918.c9.8) - [Up: c9](https://indike.org/pramana/ins.science.kaye-1918.c9) --- Source: [https://indike.org/pramana/ins.science.kaye-1918.c9.7](https://indike.org/pramana/ins.science.kaye-1918.c9.7) · Pramāṇa