Yantra Mandir
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Yantra Mandir

The Jantar Mantar is an equinoctial sundial, consisting of 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.

There are five Jantar Mantars in India, of which the largest is in Jaipur which features many instruments along with the world's largest stone sundial.[1] The Vrihat Samrat yantra is a sundial that can give the local time to an accuracy of 2 seconds.[2] It is a UNESCO World Heritage Site.

History

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

The jantars have 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.[3]

List Of Instruments:

  • Samrat Yantra
  • Jai Prakash Yantra
  • Disha Yantra
  • Rama Yantra
  • Chakra Yantra
  • Rashiwalay Yantra
  • Dingash Yantra
  • Utaansh Yantra
The Sun Dial at the Vedh Shala in Ujjain

Name

The name "Jantar Mantar" is at least 200 years old, finding a mention in an account from 1803.[4] However, the archives of Jaipur State, such as accounts from 1735 and 1737-1738, do not use this as Jantra, which in the spoken language is corrupted to Jantar.[4] The word Jantra is derived from yantra, instrument, while the suffix Mantar is derived from mantrana meaning consult or calculate.[4] The words jantar and mantar (or yantra and mantra) mean calculation instrument.

See also

References

  1. ^ Smithsonian. Timelines of Science. Penguin. p. 136. ISBN 978-1465414342.
  2. ^ pareek, Amit kumar pareek and Agam kumar. "Jantar Mantar Jaipur". amerjaipur.in. Retrieved .
  3. ^ Sankalp India Foundation. Jantart Mantar: Get lost in space! (2008-07-22).
  4. ^ a b c Sharma, V?irendra Nath (1995), Sawai Jai Singh and His Astronomy, Motilal Banarsidass Publishers Pvt. Ltd., pp. 98-99, ISBN 81-208-1256-5

External links

Coordinates: 26°55?28?N 75°49?29.5?E / 26.92444°N 75.824861°E / 26.92444; 75.824861


  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

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