Yantra Mandir

Yantra Mandir

The Yantra Mandir (commonly known as the Jantar Mantar) is an equinoctial dial, 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,Fact|date=December 2007 and declination of the Sun and the other heavenly bodies.

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

* Jantar Mantar, Jaipur
* Jantar Mantar, Delhi

The name is derived from yantra, instrument, and mantra, for formula or in this context calculation. Therefore jantar mantar means literally calculation instrument.The yantras 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. [http://sankalpindia.net/drupal/?q=jantart-mantar-get-lost-space]

External links

* [http://www.jantarmantar.org/ Jantar Mantar - The Astronomical Observatories of Jai Singh II]
* [http://perso.orange.fr/cadrans.solaires/cadrans/cadrans-jaipur.html pictures with french text]


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