Samrat Yantra

The Samrat Yantra (giant sundial) at the Jaipur Observatory

Between 1724 and 1730 Maharajah Sawaii Jai Singh II of Jaipur constructed five astronomical observatories in northern India. The observatories, or "Jantar Mantars" as they are commonly known, incorporate multiple buildings of unique form, each with a specialized function for astronomical measurement. These structures with their striking combinations of geometric forms at large scale have captivated the attention of architects, artists, and art historians world wide, yet remain largely unknown to the general public. Explore the observatories by reading more about them in the Learn section, taking a virtual Tour, or visiting the Gallery.

The Learn section, features a wealth of information about the observatories and the unique instruments Jai Singh created to observe celestial objects.
But more than that, the Learn section also features projects you can do to learn more about the observatories and sky observation without a telescope.

The Tours section features panoramic virtual tours that work on desktops, laptops, and mobile devices!

And the Gallery presents curated collections of photographs, panoramas, 3D models, and animations in a portfolio format.

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Celestial Mirror: The Astronomical Observatories of Jai Singh by Barry Perlus is a lavishly illustrated book about the Jantar Mantars. Personalized signed copies can be ordered from our store.
More about this and Preview the book…

Recent additions:
We are updating and completing many of the unfinished sections of the website. If you've been wanting to know more about the instruments and how they work, the Instruments section will be completed by March 26th.
We’ve added a project to the Learn section that features panoramas customized to work with the free open source planetarium software Stellarium. Now you can view the night sky from the Jantar Mantar!
More… is a project by Barry Perlus, Associate Professor Emeritus in Cornell University's College of Architecture, Art, and Planning. It presents the observatories through a variety of media, making it possible to explore and learn about these historic sites through interactive panoramic tours, time lapse sequences, and 3D models as well as articles, drawings, and historic texts.

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