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Yantra Mandir

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Title: Yantra Mandir  
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Subject: Ujjain, Indian astronomy, Gyarah Sidi
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Yantra Mandir

The Jantar Mantar is an equinoctial sundial, consisting a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis. On either side of the gnomon is a quadrant of a circle, parallel to the plane of the equator. The instrument is intended to measure the time of day, correct to half a second and declination of the Sun and the other heavenly bodies.


In the early 18th century, Maharaja Jai Singh II of Jaipur constructed five Jantar Mantars in total, in Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735. The most famous Jantar Mantars are:

The jantars have evocative names like, samrat yantra, jai prakash, ram yantra and niyati chakra; each of which are used to for various astronomical calculations. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets.[1]


The name "Jantar Mantar" is at least 200 years old, finding a mention in an account from 1803.[2] However, the archives of Jaipur State, such as accounts from 1735 and 1737–1738, do not use this name, referring to it simply as Jantra, which in the spoken language is corrupted to Jantar.[2] The word Jantra is derived from yantra, instrument, while the suffix Mantar is from the practice of adding a (usually meaningless) rhyming word for emphasis.[2] The words jantar and 'mantar (or yantra and mantra) in their colloquial meanings are also related, referring to magical diagrams and magical words respectively.[2] It has also been suggested that Jantar Mantar is derived from Yantra Mandira, but no evidence for this has been found.[2]

See also


External links

  • Jantar Mantar - The Astronomical Observatories of Jai Singh II, "a project initiated by Cornell University Professor of Art, Barry Perlus"
  • Pictures with French text

Coordinates: 26°55′28.45711″N 75°49′27.33″E / 26.9245714194°N 75.8242583°E / 26.9245714194; 75.8242583

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