Jantar Mantar I

This observatory was built by Sawal Jai Singh II in 1724. He was interested in calculating the planetary positions in order to plan sacred rituals at the appropriate times. The Samrat Yantra is a right-angled triangle that functions as a giant sun dial since its hypotenuse is parallel to the earth's axis. Note the calibrations along the edge of the dial. Thank you to DK Eyewitness Travel Guide for India for the facts.

Jantar Mantar II

The first picture is the Jai Prakash Yantra. It is one of two structures and was invented, it is thought, by Jai Singh himself to verify the readings of his other instruments.





The size of these instruments make them very resistant to vibrations and therefore more exact in their measurements. The small stair structure (Rashivalaya Yantra)is part of a 12 pieces that represent the zodiac signs. They each face a different constellation. Astrologers used this yantra (instrument) to cast horoscopes. It is the only one in the world. Thanks again to DK Eyewitness Travel Guide to India for the facts.

Jantar Mantar III