Jantar Mantar

The Jantar Mantar is an observatory which was built by Maharaja Jai Singh II of Jaipur. He was interest in astronomy and the sciences, and the concrete Jantar Mantar stands as a testament to his dedication and his enthusiasm for this science. This is one of the principle tourist spots in the city of Delhi, and it is visited by many tourists and locals every day. What may appear as a bunch of geometrical shapes to people, are actually instruments which were used for the revision of the calendar. It is a treat for those who love science, and also for those who love heritage sites and history.

Travel Tips

The Jantar Mantar complex is open all days from sunrise, up until sunset. The entry fee here is nominal. For Indians, it is five rupees only, while for foreigners, it is a hundred rupees.

When to visit

  • Jan
  • Feb
  • Mar
  • Apr
  • May
  • Jun
  • July
  • Aug
  • Sept
  • Oct
  • Nov
  • Dec
sprinkles Cold
  • 20.4° Max
  • 7.5° Min
  • 19.7 mm
  • Carry Heavy woollen
Things to do

The Jantar Mantar was built by Maharaja Jai Singh II, after he was asked to revise the calendar as well as the astronomical tables, by Muhammad Shah, the Mughal Emperor ruling Delhi at that time. The Jantar Mantar was built by the king in order to better calculate the position of the stars, and revise the calendar to make it more precise. This observatory was inaugurated by him in 1724, and there were 13 instruments for astronomy, which also fall under the category of architecture.

Each of these instruments helps understand the movements of the sun, the moon and the other planets. They help correct the astronomical tables and they help track time more precisely. Four major instruments are recognized at Jantar Mantar. The Samrat Yantra literally means the supreme instrument. It is a giant, concrete triangle, but it functions as an equal hour sundial. This instrument is 114 feet long, and the hypotenuse of this triangle is 128 feet long. The Hypotenuse falls parallel to the axis of the earth, and its tip points towards the North Pole. On either sides of this giant triangle shape are quadrants. These quadrants have graduations which mark the units of time, namely, the hours, minutes and seconds. Maharaja Jai Singh II took the idea of a basic sundial, and conceived this set up to use the same formula for more precise measurements.

The Jayaprakash Yantra consists of hemispheres which have been hollowed out, and which have markings on its concave insides. These markings, along with the strings which have been crisscrossed across the rim of these hemispheres help figure out the exact position of the stars, in relation to the position of the other bodies in the galaxy. This is an ingenious tool which helped greatly with astronomical observations. The Misra Yantra was the tool used to calculate the longest and the shortest days of the year. This tool was also useful in figuring out the exact moment in noon in various cities all over the country. The latter is the only instrument which had not been invented by Maharaja Jai Singh II.

Together, all the instruments come together to symbolize how advanced the country was in terms of invention, discovery and the sciences.

Places to Stay

How to Reach

  • The Jantar Mantar is located in delhi, and the airport as well as railway station in the city are fairly accessible.
  • One can get to Jantar Mantar by Metro by getting off at Patel Chowk, which is very close to Connaught Place.
  • You can also avail an auto rickshaw, a bus or a hired car to get to this site.

Surrounding Attractions

The India Gate, Agrasen Ki Baoli, Connaught Place, and Janpath are some of the places which are closest to this site.

Important Numbers

Phone number: 011 2336 5358