Observatory · Rajput · completed 1734 (Sawai Jai Singh II)
JANTAR MANTARThe Stone Instruments That Still Tell Time
The Brief
The Jantar Mantar in Jaipur, India, is an astronomical observatory completed in 1734 by Maharaja Sawai Jai Singh II, comprising 19 large masonry instruments for measuring time, predicting eclipses, and tracking celestial positions. A UNESCO World Heritage Site, it includes the Samrat Yantra — the world's largest stone sundial, accurate to about two seconds. It is best experienced with a guide who demonstrates the instruments in use. MyTripMyTravel pairs it with the adjacent City Palace.
The Jantar Mantar looks like abstract sculpture and is in fact a working scientific instrument park — 19 monumental masonry devices that still measure time and track the heavens nearly three centuries on.
Without explanation it is a curiosity; with a guide demonstrating the Samrat Yantra's two-second-accurate shadow or the zodiac instruments, it becomes one of the most intellectually rewarding stops in Jaipur.
MyTripMyTravel always pairs it with an expert guide and the adjacent City Palace, since the two share a wall and a single ticketed circuit.
Quick Facts
Jantar Mantar at a glance
What to See
THE HIGHLIGHTSSamrat Yantra
The 27 m sundial accurate to about two seconds — the centrepiece.
Jai Prakash Yantra
The hemispherical bowls mapping the sky in mirror image.
Rashivalaya
Twelve instruments, one per zodiac sign, for ecliptic measurement.
Ram Yantra
The paired cylindrical structures for altitude and azimuth.
Visitor Protocol
How We Run It
Never visit without a guide — the instruments are inert otherwise.
Mid-morning sun gives the clearest sundial demonstration.
Combine with the City Palace next door on one circuit.
Intelligence
JANTAR MANTAR FAQDo I need a guide for the Jantar Mantar?
Effectively yes — the instruments are abstract without one. We provide an expert who demonstrates them in use.
Does the sundial actually work?
Yes — the Samrat Yantra is accurate to roughly two seconds and is demonstrated live.
How long does it take?
45–60 minutes with a guide for the principal instruments.
Is it near the City Palace?
Adjacent — they share a circuit, and we sequence them together.