Jantar Mantar, Delhi – Complete Information

Introduction

Jantar Mantar in Delhi is one of the five astronomical observatories built by Maharaja Sawai Jai Singh II of Jaipur. It is an iconic heritage site that reflects India's rich scientific and astronomical legacy. Located on Sansad Marg near Connaught Place, it is a popular tourist attraction and a symbol of India's ancient wisdom in astronomy.

History

• Built by: Maharaja Sawai Jai Singh II of Jaipur

• Year of Construction: 1724

• Purpose: To compile astronomical tables and to predict the movements and timings of the sun, moon, and planets.

Sawai Jai Singh II was a scholar, mathematician, and astronomer who noticed that the existing astronomical tables were full of errors. To improve accuracy, he decided to build large instruments to observe celestial bodies with the naked eye.

Architectural Features

Jantar Mantar in Delhi consists of 13 astronomical instruments made of stone and masonry. These instruments are huge, fixed constructions that can be used to measure time, track celestial bodies, and observe astronomical events.

Some of the main instruments include:

1. Samrat Yantra:

   • A giant sun dial

   • Measures time with an accuracy of about 2 seconds

   • Has a triangular gnomon with a hypotenuse parallel to Earth’s axis

2. Jayaprakash Yantra:

   • A hemispherical instrument

   • Helps in tracking the position of celestial bodies using cross-wires and a scale

3. Rama Yantra:

   • Two circular buildings with open roof

   • Measures the altitude of stars based on Earth’s horizon

4. Misra Yantra:

   • Designed to determine the shortest and longest days of the year

   • Unique because it was an addition not built by Jai Singh himself but shows advanced astronomical understanding

Purpose and Use

The observatory was used to:

• Predict eclipses

• Track the location of stars and planets

• Determine local time

• Study the motion of celestial bodies

Despite the absence of modern tools, these instruments were very accurate for their time.

Significance

• Jantar Mantar is a symbol of India's scientific heritage.

• It shows the advanced understanding of astronomy in pre-telescope India.

• The observatory inspired the construction of similar structures in Jaipur, Ujjain, Varanasi, and Mathura.

Current Status

• Jantar Mantar in Delhi is a protected monument under the Archaeological Survey of India (ASI).

• It is open to the public and visited by tourists, historians, and students.

• Although it is no longer used for actual astronomical studies, it serves as an educational and historical landmark.

• It is also occasionally used as a site for peaceful public protests and gatherings, due to its central location in the capital.

Visitor Information

• Location: Sansad Marg, near Connaught Place, New Delhi

• Timings: 9:00 AM – 5:00 PM (Daily)

• Entry Fee:

  • Indian Citizens: ₹15

  • Foreign Tourists: ₹200

  • Children below 15: Free

• Nearest Metro Station: Janpath or Patel Chowk

Conclusion

Jantar Mantar, Delhi, is not just an ancient observatory but a tribute to India’s intellectual and scientific past. It blends architecture, astronomy, and history in a unique way. Visiting it provides insight into how advanced astronomical observations were made centuries ago—without modern technology.