Jantar Mantar

What to expect at Jantar Mantar

Jantar Mantar was built in 1724 by Sawai Jai Singh II of Amber, the astronomer-king who went on to build four more observatories, including the larger and better-preserved one at Jaipur. Commissioned to correct the astronomical tables then in use and to fix the calendar, the Delhi instruments are masonry rather than metal, built at enormous scale so that graduations could be read to a fine tolerance. Four principal instruments survive in a small walled garden off Sansad Marg: the Samrat Yantra, a giant right-angled triangle whose 27-metre hypotenuse is aligned to the pole and which functions as an equinoctial sundial; the Jai Prakash Yantra, two sunken hemispherical bowls marked with celestial coordinates; the Ram Yantra, a pair of open cylindrical structures for measuring altitude and azimuth; and the Misra Yantra, a composite instrument added later. They lost accuracy as buildings rose around them but remain the clearest surviving demonstration of pre-telescopic Indian astronomy.

The site is small and reading it is the whole point. From the gate the Samrat Yantra dominates: climb the steps beside the gnomon and you can see the curved quadrant scales on either side where the shadow falls, marked in hours and minutes. The Jai Prakash bowls are the most ingenious thing here — sunk into the ground in complementary halves so an observer can stand inside and read the position of the sun's image against marked lines. The Ram Yantra's twin open cylinders with radial walls come next, and the Misra Yantra, with its Niyat Chakra dials, stands near the western wall. Signboards explain each instrument reasonably well. The lawns are trim, the whole enclosure is about the size of two football pitches, and traffic noise from Sansad Marg is constant.

Forty-five minutes is honest; an hour if you read every board and wait for shadows to move. Come on a clear day, because the instruments do nothing at all under cloud and the site loses most of its interest in fog or rain. Mid-morning or mid-afternoon gives you long, legible shadows; noon is the least interesting because the gnomon shadow is shortest. Bring nothing; there is no cloakroom and no need. Guides occasionally wait at the gate and are worth ₹300-500 if you want the instruments demonstrated rather than described. Skip it entirely if you are also going to Jaipur, where the observatory is bigger, better preserved and a World Heritage Site in its own right.

This is the most central monument in Delhi. Patel Chowk on the Yellow Line is 600 metres north — walk down Sansad Marg for about eight minutes. Janpath on the Violet Line is 700 metres east. Rajiv Chowk, the Connaught Place interchange, is a 15-minute walk via the Outer Circle and Sansad Marg. From anywhere on the metro network expect ₹20-30 and under 25 minutes. Buses run along Sansad Marg and stop at Jantar Mantar. Parking is genuinely difficult: the roadside bays on Sansad Marg fill early and cost ₹20 an hour, and this stretch is also where protest gatherings are permitted, which periodically closes lanes. An auto from Paharganj is ₹80-100; from Karol Bagh ₹100-140.

Entry is ₹25 for Indian nationals and SAARC and BIMSTEC citizens and ₹300 for other foreign nationals, slightly cheaper on the ASI portal. Under-15s are free. A video camera permit is ₹25. There is no combined ticket with any other monument and nothing to buy inside beyond bottled water from a small stall near the gate. Given the size of the site, the foreign-national rate is the least favourable value-per-minute of any ASI monument in Delhi, which is worth knowing before you queue; if your time in the city is short, the same ₹300 goes much further at Purana Qila or Safdarjung's Tomb. For Indian visitors at ₹25 it is straightforwardly good value.

Go between 09:00 and 11:00 or between 15:00 and 17:00, when shadows are long and the instruments legible. It opens daily 09:00-18:00 including Mondays, so it fills gaps that the Red Fort cannot. Weekday mornings are quiet; weekend afternoons bring school groups who cluster at the Samrat Yantra steps. October to March is the good season, with clear skies and comfortable temperatures; December and January fog can leave the instruments useless before 10:00, which matters more here than anywhere else in the city. April to June is hot with no shade at all on the lawns. During the monsoon, cloud cover makes the sundials pointless for hours at a stretch.

It suits anyone with a scientific bent, school-age children who like puzzles, and travellers with a free hour in central Delhi. Paths are level and largely paved, so wheelchair users can reach and view every instrument, although the stairs up the Samrat Yantra gnomon are not accessible. Teenagers who respond to mechanics rather than architecture usually enjoy it more than they expect. It is a poor rainy-day option, because everything is outdoors and the instruments stop working. For a one-hour gap before a train from New Delhi station, which is 2.5 km north, it is one of the best choices in the city.

Everything in Connaught Place is walkable from here: the Inner and Outer Circle shops and restaurants are 10 minutes north, Janpath's market 8 minutes east, and Agrasen ki Baoli, a deep and free 14th-century stepwell tucked behind Hailey Road, is a 12-minute walk northeast and makes an excellent free pairing. The National Museum on Janpath is 2 km south. Honest caveats: it is small, and a visitor who does not read the signboards will be finished in fifteen minutes and feel short-changed at the foreign rate; the surrounding high-rises broke the instruments' sight lines long ago; Jaipur's Jantar Mantar is substantially more impressive; and the protest site on Jantar Mantar Road outside is a separate thing entirely, frequently confused with the monument.

Plan your visit Tickets₹25 Indian nationals · ₹300 foreign nationals Time needed45 min visit WhereConnaught Place Opening hours Daily 09:00-18:00 Ticket counter closes 17:30 Open Mondays and public holidays Hotels near Jantar Mantar

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