Jantar Mantar in Jaipur is the largest and best-preserved of the stone astronomical observatories built by Maharaja Sawai Jai Singh II, and a UNESCO World Heritage Site. Far from a ruin, it is a working collection of nineteen giant masonry instruments that measure time, track the sun and stars and predict eclipses with remarkable accuracy.
Completed around 1734, it sits beside the City Palace in the heart of the old city and contains the Samrat Yantra, the world's largest stone sundial, whose 27-metre gnomon tells local time to within seconds. This guide covers its history, the key instruments, timings, tickets and how to reach it. For the wider city, see our places to visit in Jaipur and things to do in Jaipur guides.
The history of Jantar Mantar
Jantar Mantar was built by Maharaja Sawai Jai Singh II, the founder of Jaipur, and completed around 1734. A keen astronomer and mathematician, Jai Singh built five such observatories across northern India — in Jaipur, Delhi, Ujjain, Mathura and Varanasi — but the Jaipur observatory is the largest, the most complete and the best preserved of them all.
The name comes from "yantra mantra", meaning "instruments and calculation". Dissatisfied with the small brass instruments of his day, Jai Singh built his instruments in stone and masonry on a giant scale to achieve far greater precision. The site was restored in the early twentieth century and inscribed as a UNESCO World Heritage Site in 2010.
The instruments: what to see
Samrat Yantra (the Giant Sundial): the centrepiece and the world's largest stone sundial. Its huge triangular gnomon rises about 27 metres, and its shadow moves visibly across the curved marble scales — fast enough to see — telling local solar time to an accuracy of around two seconds. This is the unmissable highlight.
Jai Prakash Yantra: two hemispherical bowls set into the ground, marked with coordinates, used to fix the position of the sun and stars by where a suspended marker casts its shadow.
Ram Yantra: a pair of cylindrical structures used to measure the altitude and azimuth (height and direction) of celestial objects.
Rashivalaya Yantra: a set of twelve separate instruments, one for each sign of the zodiac, used by astrologers to measure the position of the heavens.
There is also a smaller secondary sundial and several other dials and arcs. Because the purpose of each instrument is not obvious, hiring a guide or an audio guide at the entrance greatly enriches the visit.
Jantar Mantar timings & ticket prices
| Detail | Information |
|---|---|
| Opening hours | 9:00 AM to 4:30 PM (daily; last entry shortly before closing) |
| Indian adult ticket | Around Rs 50 (approx; subject to revision) |
| Foreign adult ticket | Around Rs 200 (approx; subject to revision) |
| Composite ticket | A combined Jaipur ticket also covers Amer, Jaigarh, Nahargarh, Hawa Mahal and Albert Hall |
| Guide / audio guide | Recommended; charged separately and well worth it to understand the instruments |
| Best time to visit | Mid-morning on a clear, sunny day so the shadows are sharp |
| Time needed | 45 minutes to 1 hour |
Tips for visiting
Jantar Mantar is best appreciated on a clear, sunny day, when the shadows cast by the instruments are crisp and you can actually watch the sundial's shadow creep along its scale. There is little shade on the open grounds, so a hat, sunglasses and water are sensible, especially in the warmer months.
Because the instruments look abstract without explanation, a guide or audio guide turns the visit from a stroll among curious shapes into a genuinely fascinating lesson in how time and the heavens were measured three centuries ago. Allow about an hour to take it in properly.
How to reach & what is nearby
Jantar Mantar stands in the heart of the old walled city, immediately beside the City Palace and a short walk from Hawa Mahal, and is easily reached by auto-rickshaw, taxi or app cab. Its central location makes it simple to combine with the surrounding sights.
Most visitors cover Jantar Mantar, the City Palace and Hawa Mahal together on a single old-city day, often adding the nearby Johari and Tripolia bazaars. See our places to visit in Jaipur guide to plan the route.
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