Jantar Mantar
{{Short description|Astronomical observatories}}
{{Other uses|Jantar Mantar (disambiguation)}}
{{Lead too long|date=December 2021}}
{{Use dmy dates|date=June 2016}}
{{Use Indian English|date=June 2016}}
File:Jantar Mantar at Jaipur.jpg in Jaipur]]
File:Prakash Yantra Jantar Mantar Jaipur.jpg
File:Jantar Mantar at Jaipur - 1928.JPG in Jaipur. 1928]]
File:Jantar Mantar Delhi 27-05-2005.jpg in New Delhi]]
A Jantar Mantar (Hindustani pronunciation: [d͡ʒən̪t̪ər mən̪t̪ər]) is an assembly of stone-built astronomical instruments, designed to be used with the naked eye. There were five Jantar Mantars in India. All were built at the command of the Rajah Jai Singh II, who had a keen interest in mathematics, architecture and astronomy. The largest example is the equinoctial sundial belonging to Jaipur's assembly of instruments, 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 can be used with an accuracy of about 20 seconds by a skilled observer to determine the time of day, and the declination of the Sun and the other heavenly bodies. It is the world's largest stone sundial, and is known as the Samrat Yantra.{{cite book|last1=Smithsonian|title=Timelines of Science|year=2013|publisher=Penguin|isbn=978-1465414342|page=136}}Archaeological Survey of India, various authors, Nomination of The Jantar Mantar, Jaipur, for inclusion on World Heritage list, p.14 [https://whc.unesco.org/uploads/nominations/1338.pdf]
The Jaipur Jantar Mantar is a UNESCO World Heritage Site.[https://whc.unesco.org/en/list/1338/ Unesco listing for Jantar Mantar] accessed July 30 2021
History
In the early 18th century, Maharaja Jai Singh II of Jaipur constructed five Jantar Mantar in total, in New Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735. Of these, the observatory at Mathura and the fort that protected it were destroyed before 1857.{{Cite web|url=http://www.jantarmantar.org/learn/observatories/sites/index.html|title=The Observatory Sites|access-date=2024-01-29|language=en}}
As part of Jantar Mantar there were many instruments like Samrat Yantra, Jai Prakash Yantra, Disha Yantra, Rama Yantra, Chakra Yantra, Rashiwalya Yantra, Dingash Yantra and Utaansh Yantra. The primary purpose of the instruments was to compile astronomical tables and to predict the times and movements of the sun, moon and planets.
Image:Vedh Shala, Ujjain 01.jpg at the Vedh Shala in Ujjain]]
Name
The name "Jantar Mantar" is at least 200 years old, being mentioned in an account from 1803. 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. The word Jantra is derived from yantra, instrument, while the suffix Mantar is derived from mantrana meaning consult or calculate.
See also
References
{{Reflist|refs=
| last = Sharma
| first =Virendra Nath
| year = 1995
| pages = 98–99
| title = Sawai Jai Singh and His Astronomy
| publisher = Motilal Banarsidass Publishers Pvt. Ltd.
| isbn = 81-208-1256-5
| url = https://books.google.com/books?id=QRA2mgZnXXMC&pg=PA98
}}
}}
- {{citation
|author=Anisha Shekhar Mukherji
|title=Jantar Mantar: Maharaja Sawai Jai Singh's Observatory in Delhi
|url=https://books.google.com/books?id=QyI6tKjRhdgC
|access-date=23 July 2013
|year=2010
|publisher=Ambi Knowledge Resource
|isbn=978-81-903591-1-5}}
External links
{{commons category|Jantar Mantars}}
- [http://www.jantarmantar.org/ Jantar Mantar - The Astronomical Observatories of Jai Singh II], "a project initiated by Cornell University Professor of Art, Barry Perlus"
- [http://perso.orange.fr/cadrans.solaires/cadrans/cadrans-jaipur.html Pictures with French text]
- [http://7thtraveler.com/jantar-mantar-jaipur-history-timings-entry-fee-images-information/ Jantar Mantar Jaipur Timings, Entry Fee]
- [https://www.bbc.com/travel/article/20220530-jantar-mantar-indias-mysterious-gateway-to-the-stars India's mysterious gateway to the stars] BBC Travel (2022-05-31)
{{Indian astronomy}}
{{Telescopes and Observatories in India}}
{{Indian mathematics}}
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{{Coord|26|55|28|N|75|49|29.5|E|source:dewiki_region:IN|display=title}}
Category: Ancient astronomical observatories
Category: Astronomical observatories in India
Category: Buildings and structures in Delhi