Jantar Mantar Jaipur observatory
Jantar Mantar Jaipur observatory has many architectural astronomical instruments of 1728. These instruments of Jantar Mantar help to calculate Jaipur local time, declination of stars, locate the pole star, indicate the hemispherical position of heavenly bodies, calculate the positions of various constellations at different intervals, Meridian Pass time, Zenith Distance, altitude of the heavenly bodies etc. These instruments are architectural masonry structures. Jantar Mantar Jaipur is a World Heritage Site of UNESCO because it is the only well preserved observatory of India.