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Jantar Mantar
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Delhi's Jantar Mantar is the first of the five observatories that he Jantar Mantarbuilt with large masonary instruments. The observatory has the Samrat Yantra, a simple equal hour sun dial, the Ram yantra for reading altitudinal angles; Jai Prakash for ascertaining the position of the sun and other celestial bodies, and the Misra Yantra which is a combination of four scientific gadgets.

Jantar Mantar is not only a sundial of celestial bodies, but it also symbolizes the technological achievements under the Rajput kings and their endeavor to resolve the astronomical mysteries. The Jantar Mantar of Delhi is only one of the five observatories built by Maharaja Jai Singh II. The other four Jantar Mantar are located at Jaipur, Varanasi, Ujjain and Mathura. All of these were built as far back as AD 1724-1730. The period marked as the dark age of Indian history, pertaining to the downfall of the Mughal Empire. Delhi's Jantar Mantar is the first of the five observatories that Maharaja Jai Singh built with huge masonry instruments.
Attractions in Delhi
Qutub Minar
India Gate
Red Fort
Jantar Mantar
Temples in Delhi
Lotus Temple
Jama Masjid
ISKON Temple
Birla Mandir

The name of the observatory means "instrument and formula". There is a huge sun dial called "Samrat Yantra" and the accuracy of this instrument is such that it can measure and calculate the time of the day with an accuracy of half a second. It is said that Jai Singh was the person who designed the machine. There are two pillars at the south-western part of the observatory which determines the longest and the shortest day. In the winter it is observed that the shadow of one pillar falls over the other completely while in the summer you will see that no shadow falls at all.

The calculating algorithms for celestial object positions had not been corrected for more than thousand years due to lack of precessions of earth's axis of rotation. This effect was observed as far back as the Vedic times ad is called Ayanamasa. Whenever there was a difference in the calculated and predicted elements due to precessions, ad-hoc corrections called Bija corrections were applied so that the calculations and the observations match each other. These corrections were never organized and classical treatise does not mention these. Jai Singh felt that corrections were needed to be made to the existing methods of calculations with precise observations. Jai Singh constructed a huge observatory of masonry for precise observation. It is made of brick and plaster and consist of extruded, interlocked shapes externally. He started with the brass instruments in his observatory but soon gave them up because of several inherent flaws. They were too small and their axes were unstable displacing the center often. He then decided to follow the style of the renowned Arab astronomer, Prince Ulugh Beg, builder of the famous 15th century AD observatory at Samarkand, Uzbekistan. The massive masonry instruments at the observatory at Samarkand suited Jai Singh's architectural tastes and were far more accurate because of their size.

Jantar Mantar has
  • Samrat Yantra
    An equinoctial Sun dial - the largest and the most imposing structure at the Observatory.
  • Misra Yantra
    A mixed instrument which incorporates many interesting functions.
  • Jayaprakash
    The 'Crest Jewel' of instruments consisting of two complimentary concave hemispheres, reflecting the dome of the sky.
  • Ram Yantra
    Two imposing circular complementary buildings, designed for very easy determination of local celestial co-ordinates.

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