Jantar Mantar is one of the most known and Famous Monuments in Delhi. The real name of Jantar Mantar is Yantra Mantra which literally means the instrument and formula and is located in the modern city of New Delhi.
The primary purpose of the observatory was to compile astronomical tables and to predict the times and movements of the sun, moon and planets. Jai Singh II built five similar observatories all known by same name but at different places in India.
Now a day’s all these observatories are mainly a tourist attraction and are significant in the history of astronomy. Yantra Mantras is one of the five observatories well known by Jantar Mantar, in west central India i.e. Delhi others including at Jaipur- Yantra Mantra, Ujjain, Mathura and Varanasi.
Different Instruments of Jantar Mantar
Jantar Mantar in Delhi has four different Instruments which are distinct and unique. These four instruments are named as the Samrat Yantra, the Ram Yantra, the Jayaprakash, and the Mishra Yantras.
The Samrat Yantra is a huge triangle that is an equal hour sundial. Its dimensions are 70 feet high, 114 feet long at the base, and 10 feet thick. It points towards the North Pole and is parallel to the earth’s axis having 128 foot long hypotenuse.
On both the sides of the triangle is a quadrant with graduations indicating hours, minutes and seconds. The sundial of the Samrat Yantra was so designed in order to measure declination and other related coordinates of various heavenly bodies. The Jayaprakesh Yantra consists of hollowed out hemispheres with number of markings on their concave surfaces.
The stretching of cross wires between the points of their rim is good to see where as the position of star with various markings or a window’s edge can be aligned from inside the Ram. The Mishra Yantra was a unique construction which was able to indicate, when it is noon in various cities all over the world.