The Jantar Mantar, Jaipur
Rajasthan
Photos
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These are not sculptures. They are instruments — and the big one still tells the time to within about two seconds.
What you're looking at
An observatory of nineteen masonry astronomical instruments built by Sawai Jai Singh II between 1728 and 1734. He built five such observatories across northern India; the Jaipur one is the largest and best preserved. Each instrument measures something specific: time, declination, the position of a star, the altitude of the sun.
Why it matters
Jai Singh built in stone and marble rather than metal deliberately — bigger instruments give finer readings, and masonry does not warp. It is the most complete surviving observatory of its kind anywhere, and it represents a moment when Indian, Islamic and European astronomy were being actively compared. UNESCO inscribed it in 2010.
Look for these
01
The Samrat Yantra
A sundial about 27 metres high — the tallest in the world. Its shadow moves visibly, roughly a millimetre a second, and it reads local time to about two seconds. Stand and watch it move.
02
The twelve zodiac instruments
The Rashivalaya Yantra is a set of twelve separate instruments, one per zodiac sign, each aligned to its constellation. They are used only when that sign crosses the meridian.
03
The bowls sunk into the ground
The Jai Prakash Yantra is a pair of hollowed hemispheres with crosswires above. An observer climbs inside to read the sun's position off the marked surface.
04
Everything is aligned to Jaipur
The instruments are calibrated for this latitude specifically. They would not work correctly anywhere else.
05
It is still used
Local astronomers use the instruments to this day, and the monsoon arrival is still predicted here by tradition.
Before you go
- A guide genuinely helps — without one the instruments look like abstract architecture.
- Go on a clear day. Nothing works under cloud.
- Midday is best for the sundials, though it is hot and there is little shade.
- It sits beside the City Palace and is easily combined with it and the Hawa Mahal.
- Allow an hour.
Visitor guide to The Jantar Mantar, Jaipur.
Visiting
Entry fee and daily timings weren't available from an official source — please confirm on site.
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