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Jaipur Jantar Mantar : Jantar Mantar is one of the biggest and most important historical monuments in India that showcases the Indian astronomical science and knowledge. The observatory was built by Maharaja Jai Singh in 1727 as a resting place for the astronomical instruments. The overall structure is made up of 19 stone instruments, which were put together to show length, digits of Pi, diameter and circumference of planets, etc.

Do You Know About :
Vrihat Smart Yantra : The Vrihat Samrat Yantra, which means the "great king of instruments", is 88 feet (27 m) high; its shadow tells the time of day. Its face is angled at 27 degrees, the latitude of Jaipur. The Hindu chhatri (small cupola) on top is used as a platform for announcing eclipses and the arrival of monsoons.

Laghu Smarat Yantra : The small Sundial or Laghu Samrat Yantra is the instrument used to calculate the time. The scale of the Sundial is divided into hours. The hours are divided into intervals of one hour, one-quarter hour, five minutes, one minute.

Ram Yantra : The Rama Yantra is used to observe the position of any celestial object by aligning an object in the sky with both the top of the central pillar, and the point on the floor or wall that completes the alignment.

Jaya Prakash Yantra : The Jai Prakash may well be Jai Singh's most elaborate and complex instrument. It is based on concepts dating to as early as 300 B.C. when the Greco-Babylonian astronomer Berosus is said to have made a hemispherical sundial. The smaller Kappala Yantra at Jaipur is an example of such a dial.

Chakra Yantra : The Sri Yantra, Shri Yantra, or Shri Chakra is a form of mystical diagram (yantra) used in the Shri Vidya school of Hinduism. It consists of nine interlocking triangles - four upward ones which represent Shiva, and five downward ones representing Shakti. All these surround the central point, the bindu.

Digamsha Yantra : Digamsa Yantra, a cylindrical calculation instrument at Jantar Mantar in Jaipur, Rajasthan, India. The Digamsa Yantra is a cylindrical calculation instrument used to determine the azimuth of a celestial object.

Nadivalaya Yantra : Nadivalaya Yantra, is a version of an equinoctial sun dial quite different from the design of the Samrat Yantra. The two circular plates that are facing the north and south and are parallel to the axis of the rotation of Earth. The movement of the shadow of these rods indicates the time.

Kranti Vritya Yantra : Jantar Mantar is an instrument comprising geometric towers of architectural astronomy that are used to measure the time and movements of astronomical objects in the sky. The tallest structure among them is called Samrat Yantra, which consists of a central main tower, four tall pedestal corner towers and four shorter basal corner towers. A few other instruments are also found close to Jantar Mantar.