Jantar Mantar (जंतर मंतर)
Jantar Mantar is located at the Sansad Marg in the New Delhi area. It was built by Maharaja Jai Singh II of Jaipur and the construction was started in the year 1723. This was one of the five sites that were constructed by the Maharaja Jai Singh. He started the construction of Jantar Mantar because he was handed over the task of updating the calendar and the tables which work according to the astronomies.
It was brought to notice that according to the survey that the actual date of construction was mistakenly taken as 1710. But when the research was done later it was searched that the actual date was in the year 1724. It was rectified and whole of the documents entitling the details regarding the construction was changed accordingly.
Construction of Jantar Mantar
Earlier, when no watch was invented people used daily items to estimate the time at that instant. The manufacturing of Jantar Mantar was only done to ease the time calculation in that period. The construction of Jantar Mantar is done in a way that it can show the time according to the sunlight falling on it. This was made such that the movements of Sun, Moon and other planets could be observed.
Individual Structures Construction
The Jantar Mantar constitutes of three individual instruments or structures and each of which has their unique significance. The three instruments are: Samrat Yantra, the Jayaprakash, and the Misra Yantra. The Samrat Yantra is the giant triangle that lies in the centre of the Jantar Mantar and it acts as the hour hand of the clock. Jayaprakash Yantra is basically hemispheres which are hollow from inside and has shape of concave mirror. Misra Yantra tells us about which is the shortest and longest day of a year.