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 and the
other heavenly bodies.
There are five
Jantar Mantar monuments in India, of which the largest
Jaipur which features many instruments along with the world's
largest stone sundial. The Vrihat Samrat yantra is a sundial that
can give the local time to an accuracy of 2 seconds. It is a UNESCO
World Heritage Site.
3 See also
5 External links
In the early 18th century,
Jai Singh II
Jai Singh II of
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 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.
List Of Instruments:
Jai Prakash Yantra
Sun Dial at the
Vedh Shala in Ujjain
The name "Jantar Mantar" is at least 200 years old, finding a mention
in an account from 1803. However, the archives of
such as accounts from 1735 and 1737–1738, do not use thisas 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. The words
jantar and 'mantar (or yantra and mantra) means calculation
Jantar Mantar in Jaipur, Rajasthan
Jantar Mantar in New Delhi
Jantar Mantar in Varanasi
Jantar Mantar in Ujjain
List of archaeoastronomical sites sorted by country
^ Smithsonian. Timelines of Science. Penguin. p. 136.
^ pareek, Amit kumar pareek and Agam kumar. "
Jantar Mantar Jaipur".
amerjaipur.in. Retrieved 2016-01-01.
India Foundation. Jantart Mantar: Get lost in space!
^ a b c Sharma, Virendra Nath (1995), Sawai Jai Singh and His
Astronomy, Motilal Banarsidass Publishers Pvt. Ltd., pp. 98–99,
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
Wikimedia Commons has media related to Jantar Mantar.
Jantar Mantar - The Astronomical Observatories of Jai Singh II, "a
project initiated by Cornell University Professor of Art, Barry
Pictures with French text
Jaipur Timings, Entry Fee
Melpathur Narayana Bhattathiri
Mādhava of Saṅgamagrāma
Shanti Swarup Bhatnagar Prize recipients in Mathematical Science
Kerala school of astronomy and mathematics
Jantar Mantar (Jaipur, Delhi)
T. A. Sarasvati Amma
A. A. Krishnaswami Ayyangar
Radha Charan Gupta
K. V. Sarma
Prabodh Chandra Sengupta
Walter Eugene Clark
Indian Statistical Institute
Chennai Mathematical Institute
Institute of Mathematical Sciences, Chennai
Indian Institute of Science
Harish-Chandra Research Institute
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