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.




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