Jantar Mantar in Jaipur is the largest of five astronomical observatories built by Maharaja Jai Singh during the period 1727-1734. Consisting of 14 major geometric devices for measuring time, predicting eclipses, tracking stars in their orbits, ascertaining the declination of planets and determining the celestial altitudes, the observatory is a major attraction for kids and adults alike. There is not a single boring moment as you marvel at the operations of these devices.
The name Jantar Mantar literally translates into instrument of calculation. Visiting the place is a fascinating experience as one can learn how our ancestors used limited technology to study and decipher some complicated facts of science. The biggest instrument here is the Samrat Yantra. This 90 feet structure is used to measure the time of the day by calculating and observing the placement and length of the shadow. There are even some smaller instruments which are a feat of architecture and show noteworthy design and functions like the Ram Yantra.