Fateh Sagar Lake

Jantar Mantar, standing as a monumental UNESCO World Heritage open air stone observatory in the historic Walled City of Jaipur in Rajasthan, represents the pinnacle of 18th century Rajput astronomical science and architectural brilliance.

Designed and constructed between 1728 and 1734 AD by Jaipur's visionary founder, the astronomer king Maharaja Sawai Jai Singh II, this extraordinary scientific complex features 19 monumental architectural instruments (Yantras) sculpted from local sandstone and white marble for naked eye celestial tracking.

It's the home of the colossal 27 meter-tall Vrihat Samrat Yantra standing as the world's largest stone sundial accurate to within two seconds, the dual sunken hemispherical bowls of the Jai Prakash Yantra, 12 zodiac constellation instruments of the Rashivalaya Yantra, and the monumental Ram Yantra for measuring celestial altitudes.

It represents a rich scientific sanctuary where ancient Vedic astronomy, Islamic astrolabe mathematics, European geometry, and grand Rajasthani stonecraft unite in the heart of the Pink City.

Located directly opposite the City Palace entrance and just a five minute walk from Hawa Mahal, it sits 5 km from Jaipur Junction Railway Station (JP) and 13 km from Jaipur International Airport (JAI), easily accessible by metro (Chhoti Chaupar station), auto rickshaw, or tourist cab.

Maharaja Sawai Jai Singh II & 18th Century Astronomy

In the early 1700s, Maharaja Sawai Jai Singh II studied Ptolemaic Greek astronomy, Persian Zij tables, and European planetary calculations, concluding that small brass instruments were prone to physical distortion and measurement errors.

To achieve unprecedented precision, he commissioned colossal stone and marble instruments anchored deeply in stone foundations across five royal cities, with Jaipur's Jantar Mantar serving as his grandest and best preserved observatory.

Truth is, despite being built nearly three centuries ago, these architectural instruments remain fully functional, accurately predicting solar eclipses, tracking planetary transits, and calculating local Jaipur solar time.

The Vrihat Samrat Yantra & The Jai Prakash Yantra

Vrihat Samrat Yantra: Towering 27 meters (90 feet) high, this giant equinoctial sundial casts a shadow that visibly sweeps across its calibrated marble quadrant at 1 millimeter per second, measuring local time with a precision of 2 seconds.

Jai Prakash Yantra: Composed of two sunken subterranean hemispherical marble bowls mapped with inverted celestial coordinates, observers walk inside along stone passages to line up stars with crosswires stretched overhead.

Rashivalaya Zodiac Yantras & Sound and Light Show

Rashivalaya Yantras: A circle of 12 distinct instruments, each angled precisely toward one of the 12 zodiac constellations (Aries, Taurus, Gemini, etc.), enabling royal astrologers to draft exact horoscopes the moment a sign crossed the meridian.

Evening Sound & Light Show: At nightfall, an engaging audio visual show illuminates the stone yantras, narrating the scientific passions of Jai Singh II under the starry desert sky.

After exploring Jantar Mantar, step across the square into the royal courtyards of City Palace, photograph the iconic honeycombed facade of Hawa Mahal, or journey to the hilltop ramparts of Amber Fort.