March 31, 2023
Jantar Mantar

Jantar Mantar | The World’s Largest Sundial: A Marvel of Astronomy in Jaipur, India

India is a land of ancient monuments and architectural marvels. From the famous Taj Mahal to the temples of Khajuraho, India is home to some of the world’s most fascinating structures. One such marvel is the world’s largest sundial located in the city of Jaipur, Rajasthan.

Introduction to Sundials

Sundials have been used since ancient times as a way of measuring time. These time-telling devices work on the principle of casting a shadow on a fixed plate or dial, known as the gnomon, as the sun moves across the sky. The shadow moves across the dial, indicating the time of day based on the position of the sun.

credit: getty images

The Largest Sundial in the World

The sundial in Jaipur, also known as the Jantar Mantar, is the largest sundial in the world. It was built in the early 18th century by Maharaja Sawai Jai Singh II, who was an avid astronomer and mathematician. The Jantar Mantar consists of a collection of nineteen architectural astronomical instruments, including the sundial, which was the most significant of them all.

The sundial at Jantar Mantar is 27 meters high, and its shadow moves at a speed of approximately one millimeter per second. The dial is made of marble and is positioned at an angle of 27 degrees. It has markings that indicate time in 31 different zones, allowing for a high degree of precision. The sundial also has a unique feature that allows it to tell the time accurately, even during the monsoon season when the sky is often cloudy.

The Importance of the Jantar Mantar

The Jantar Mantar is an essential site for astronomers and scientists. It was built at a time when accurate measurements of time and space were critical for navigation and astrological predictions. The sundial at Jantar Mantar was one of the most significant inventions of its time, and it paved the way for further advancements in the field of astronomy.


The world’s largest sundial at the Jantar Mantar in Jaipur, India, is a testament to the country’s rich history and culture. The magnificent structure is not only an architectural marvel but also a scientific wonder that has contributed significantly to the field of astronomy. It is a reminder of the importance of preserving ancient monuments and their legacy for future generations.

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