The
**Jantar Mantar**

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**

Sun and the
other heavenly bodies.
There are five
**Jantar Mantar**

Jantar Mantar monuments in India, of which the largest
is in
**Jaipur**

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.

Contents

1 History
2 Name
3 See also
4 References
5 External links

History[edit]
In the early 18th century,
**Maharaja**

Maharaja
**Jai Singh II**

Jai Singh II of
**Jaipur**

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 evocative names like Samrat Yantra, Jai Prakash, Ram
**Yantra**

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**

Sun Dial at the
**Vedh Shala**

Vedh Shala in Ujjain

Name[edit]
The name "Jantar Mantar" is at least 200 years old, finding a mention
in an account from 1803.[4] However, the archives of
**Jaipur**

Jaipur State,
such as accounts from 1735 and 1737–1738, do not use thisas 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) means calculation
instrument.
See also[edit]

**Jantar Mantar**

Jantar Mantar in Jaipur, Rajasthan
**Jantar Mantar**

Jantar Mantar in New Delhi
**Jantar Mantar**

Jantar Mantar in Varanasi
**Jantar Mantar**

Jantar Mantar in Ujjain
List of archaeoastronomical sites sorted by country
Mantra
Yantra

References[edit]

^ Smithsonian. Timelines of Science. Penguin. p. 136.
ISBN 978-1465414342.
^ pareek, Amit kumar pareek and Agam kumar. "
**Jantar Mantar**

Jantar Mantar Jaipur".
amerjaipur.in. Retrieved 2016-01-01.
^ Sankalp
**India**

India Foundation. Jantart Mantar: Get lost in space!
(2008-07-22).
^ a b c 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**

Maharaja Sawai Jai
Singh's Observatory in Delhi, Ambi Knowledge Resource,
ISBN 978-81-903591-1-5, retrieved 23 July 2013

External links[edit]

Wikimedia Commons has media related to Jantar Mantar.

**Jantar Mantar**

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**

Jantar Mantar
**Jaipur**

Jaipur Timings, Entry Fee

v
t
e

Indian mathematics

Mathematicians

Ancient

Apastamba
Baudhayana
Katyayana
Manava
Pāṇini
Pingala
Yajnavalkya

Classical

Āryabhaṭa I
Āryabhaṭa II
Bhāskara I
Bhāskara II
Melpathur Narayana Bhattathiri
Brahmadeva
Brahmagupta
Brihaddeshi
Govindasvāmi
Halayudha
Jyeṣṭhadeva
Kamalakara
Mādhava of Saṅgamagrāma
Mahāvīra
Mahendra Sūri
Munishvara
Narayana Pandit
Parameshvara
Achyuta Pisharati
Jagannatha Samrat
Nilakantha Somayaji
Śrīpati
Sridhara
Gangesha Upadhyaya
Varāhamihira
Sankara Variar
Virasena

Modern

Shanti Swarup Bhatnagar Prize recipients in Mathematical Science

Treatises

Āryabhaṭīya
Bakhshali manuscript
Bijaganita
Brāhmasphuṭasiddhānta
Ganita Kaumudi
Karanapaddhati
Līlāvatī
Lokavibhaga
Paulisa Siddhanta
Paitamaha Siddhanta
Romaka Siddhanta
Sadratnamala
Siddhānta Shiromani
Śulba Sūtras
Surya Siddhanta
Tantrasamgraha
Vasishtha Siddhanta
Veṇvāroha
Yuktibhāṣā
Yavanajataka

Centres

Kerala school of astronomy and mathematics
Ujjain
**Jantar Mantar**

Jantar Mantar (Jaipur, Delhi)

Historians of
mathematics

Bibhutibhushan Datta
T. A. Sarasvati Amma
A. A. Krishnaswami Ayyangar
Sudhakara Dvivedi
Radha Charan Gupta
Kim Plofker
K. V. Sarma
Bapudeva Sastri
Prabodh Chandra Sengupta

Translators

Walter Eugene Clark
David Pingree

Other regions

Babylonian mathematics
Chinese mathematics
Greek mathematics
Islamic mathematics
European mathematics

Modern
institutions

Indian Statistical Institute
Chennai Mathematical Institute
Institute of Mathematical Sciences, Chennai
Indian Institute of Science
Harish-Chandra Research Institute
Bhaskaracharya Pratishthana
Ramanujan Institute for Advanced Study in Mathematics
Tata Institute of Fundamental Research
Homi Bhabha Centre for Science Education

Coordinates: 26°55′28″N 75°49′29.5″E / 26.92444°N
75.824861°E / 2