Monuments in Delhi - Jantar Mantar

The Jantar Mantar was built in 1710 by Raja Jai Singh II of Jaipur (1699-1743) in Delhi. This is an observatory consisting of mason-built astronomical instruments to chart the course of the heavens. Jai Singh, who was a very scholarly king with a very keen interest in astronomy and astrology, had other observatories built too – in Ujjain, Jaipur, Mathura (which no longer survives) and Varanasi.

The first among these was this one in Delhi. The yantras (instruments, which has been distorted to Jantar) are built of brick rubble and plastered with lime. The yantras have evocative names like, samrat yantra, jai prakash, ram yantra and niyati chakra; each of which are used to for various astronomical calculations.