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(Redirected from Yantra Mandir) Astronomical observatories For other uses, see Jantar Mantar (disambiguation).

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A Jantar Mantar (Hindustani pronunciation: ) 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. The Jaipur Jantar Mantar is a UNESCO World Heritage Site.

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.

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.

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.

References

Smithsonian (2013). Timelines of Science. Penguin. p. 136. ISBN 978-1465414342.
Archaeological Survey of India, various authors, Nomination of The Jantar Mantar, Jaipur, for inclusion on World Heritage list, p.14
Unesco listing for Jantar Mantar accessed July 30 2021
"The Observatory Sites". Retrieved 29 January 2024.
^ Sharma, V‌irendra Nath (1995), Sawai Jai Singh and His Astronomy, Motilal Banarsidass Publishers Pvt. Ltd., pp. 98–99, ISBN 81-208-1256-5

Anisha Shekhar Mukherji (2010), Jantar Mantar: Maharaja Sawai Jai Singh's Observatory in Delhi, Ambi Knowledge Resource, ISBN 978-81-903591-1-5, retrieved 23 July 2013

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
Jantar Mantar Jaipur Timings, Entry Fee
India's mysterious gateway to the stars BBC Travel (2022-05-31)

v t e Indian astronomy
Astronomers	Apastamba Aryabhata I Aryabhata II Vainu Bappu Bhāskara I Bhāskara II Baudhayana Brahmagupta Sandip Chakrabarti Radhagobinda Chandra Subrahmanyan Chandrasekhar Amil Kumar Das P. Devadas Gautama Siddha M. K. Das Gupta Jyesthadeva Kamalakara Katyayana Lagadha Lalla Madhava of Sangamagrama Prasanta Chandra Mahalanobis Mahavira Manava Jayant Narlikar Parameshvara Achyuta Pisharati Venkatraman Radhakrishnan J. J. Rawal Megh Nad Saha Jagannatha Samrat Bapudeva Sastri Jai Singh II of Amber Nilakantha Somayaji Sripati Mahendra Suri Govind Swarup Utpala Varahamihira Shankara Variyar Vasistha Yajnavalkya Pathani Samanta
Works	Aryabhatiya Brahmanas Aitareya Brahmana Shatapatha Brahmana Bṛhat Saṃhitā Ganitagannadi Jyotirmimamsa Shulba Sutras Panchangam Khandakhadyaka Mahādevī Makarandasarini Siddhantas Brāhmasphuṭasiddhānta Maha-Siddhanta Pancha-Siddhantika Paulisa Siddhanta Paitamaha Siddhanta Rājamṛgāṅka (astronomy book) Romaka Siddhanta Surya Siddhanta Vasishtha Siddhanta Tantrasangraha Treatise on Astrology of the Kaiyuan Era Vākyakaraṇa Vedanga Jyotisha Vedas Atharvaveda Rigveda Yavanajataka Zij
Instruments	Armillary sphere Astrolabe Celestial globe Compass Cross-staff Dioptra Equatorial ring Equatorial sundial Globe Gnomon Mural instrument Quadrant Sextant Sundial Triquetrum Water clock Yantraraja
Concepts	Axial tilt Azimuth Cardinal direction Celestial equator Celestial sphere Celestial spheres Center of mass Circular orbit Deferent and epicycle Earth's rotation Eccentricity Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of time Jyotiṣa Kali ahargaṇa Kalpa Karana Manvantara Moonlight Nakshatra Nityayoga Parallax Precession Ritu Spherical Earth Sunlight Tithi Vāra Yuga Zodiacal sign
Centres	Jantar Mantar Jaipur New Delhi Ujjain Varanasi Kerala school of astronomy and mathematics
Other regions	Babylonian astronomy Ancient Greek astronomy Hellenistic astronomy Islamic astronomy Chinese astronomy European astronomy
Months of the Vedic calendar	Chaitra Vaisakha Jyeshta Aashaadha Shraavana Bhadrapada Ashvin Kartik Margashirsha Pausha Maagha Phalguna

v t e Telescopes and Observatories in India
Observatories	Allahabad Observatory Aryabhatta Research Institute of Observational Sciences Colaba Observatory Devasthal Observatory Gauribidanur Radio Observatory Girawali Observatory Gyarah Sidi India-based Neutrino Observatory Indian Astronomical Observatory Indian Initiative in Gravitational-wave Observations Indian Institute of Astrophysics Kodaikanal Solar Observatory Madhava Observatory Madras Observatory Mount Abu InfraRed Observatory National Centre for Radio Astrophysics Tara Wali Kothi Trivandrum Observatory Udaipur Solar Observatory Vainu Bappu Observatory
Telescopes	3.6m Devasthal Optical Telescope Giant Metrewave Radio Telescope Jantar Mantar Jantar Mantar, Jaipur Jantar Mantar, New Delhi Jantar Mantar, Varanasi Major Atmospheric Cerenkov Experiment Telescope National Large Solar Telescope Ooty Radio Telescope Pachmarhi Telescope Array

Telescopes and Observatories in India

Ancient	Apastamba Baudhayana Katyayana Manava Pāṇini Pingala Yajnavalkya
Classical	Āryabhaṭa I Āryabhaṭa II Bhāskara I Bhāskara II Melpathur Narayana Bhattathiri Brahmadeva Brahmagupta Govindasvāmi Halayudha Jyeṣṭhadeva Kamalakara Mādhava of Saṅgamagrāma Mahāvīra Mahendra Sūri Munishvara Narayana Parameshvara Achyuta Pisharati Jagannatha Samrat Nilakantha Somayaji Śrīpati Sridhara Gangesha Upadhyaya Varāhamihira Sankara Variar Virasena
Modern	Srinivasa Ramanujan Satyendra Nath Bose P.C. Mahalanobis Subrahmanyan Chandrasekhar C.R. Rao Veeravalli S. Varadarajan S. R. Srinivasa Varadhan K. R. Parthasarathy (probabilist) M. S. Narasimhan C. S. Seshadri Harish-Chandra Subbayya Sivasankaranarayana Pillai Tilak Raj Prabhakar Manjul Bhargava Akshay Venkatesh Ravi Vakil Kannan Soundararajan Shanti Swarup Bhatnagar Prize recipients in Mathematical Science