Mughal ruler Muhammad Shah advised to Sawai Jai Singh II (a great astronomer) to build some astronomical observatory instruments to create calendar & astronomical tables and to predict the times and movements of the sun, moon and planets. Sawai Jai Singh II constructed five observatories during 1724 to 1734 throughout India which is located at Delhi, Jaipur, Varanasi, Ujjain and Mathura. Jantar Mantar of Delhi is one of these five observatories which built in 1724 ad.

(Delhi Jantar Mantar, an astronomical observatory)

Jantar Mantar is made of with red sandstone on the Parliament Street, little away from Connaught Place of New Delhi. And its surrounding areas are covered with lots of shady trees which protects tourists from sunshine. Literally, Jantar Mantar means instrument for calculation. There have five main instruments inside the Jantar Mantar for calculation in Delhi. These are the Samrat Yantra, Jay Prakash Yantra, Ram Yantra, Niyati Chakra and Mishra Yantra.

Samrat Yantra or Supreme Instrument was used as an equal hour sundial to measure the time of the day. It is about 70 ft high, 114 feet long at the base, and 10 ft thick.

Jay Prakash Yantra was designed by Sawai Jai Singh himself. It consists of hollowed out hemispheres which basically used to find the position of the sun and other solar bodies.

Ram Yantra is another important instrument of Jantar Mantar. It mainly, consists of two large buildings. It was used to measure the altitude of stars or other solar bodies.

Mishra Yantra used to indicate the position (noon) of the sun. There have two pillars near Mishra Yantra used to find out the longest and the shortest days in the year.

Travel by Roadways Delii roadway network is very well connected to other neighboring states and you will get daily basis buses to this city. Jantar Mantar is located at Parliament Street close to Delhi Connaught Place. After reaching Connaught Place you will easily able to reach here with a cabs or walking.

Travel by Railways New Delhi Railway Station is the closest big junction from Jantar Mantar. You can reach to this station from any other states of India with several regular basis trains. After reaching to this station you can travel with a bus or car to there. Patel Chowk station is nearest metro station to Jantar Mantar.

Travel by Airways Delhi is well connected with domestic and international flights to all the major cities and countries of the world. If you are a foreign tourist then Indira Gandhi International Airport will be the suitable destination to you and for the country tourists or locals, the Palam Domestic Airport provides lots of regular flights to and from Delhi.

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Asian International Hotel Janpâth Lane, Connaught Place Phone: 011-43590100.	Host Inn, Connaught Place F Block, Rajiv Chawk, Connaught Place Phone: 011-23310523.
The Connaught Hotel, New Delhi Bhagat S¡ngh Marg, Connaught Place Phone: 011-23364225.	Clark Group of Hotels Mercantile House, Connaught Place Phone: 011-23706050.
History Logistics, Connaught Place Harsha Bhawan, Middle Circle Phone: 011-23415973.	Hotel Janpath, Connaught Place Janpath Róad, New Delhi Phone: 011-23347083.

Country	India
Union Territory	Delhi
STD Code	011
ISD Code	009111
Landmark	Parliament Street, close to Connaught Place.
Nearest Metro Station	Patel Chowk
Languages	Hindi (main language), English, Punjabi, etc.
Best season to visit	Winter
Founder	Sawai Jai Singh II.
Built in	1724 ad.
Open Days	Every Day
Entry fees	5 Rs.for Indian, 100 Rs. for foreigners.
Timing	: 9:00 am to 7:00 pm..
Nearest Big Junction	New Delhi Railway Station.