After getting our car and driver hired we set the route and out first point of call was Jantar Mantar. It is a compound with huge observation instruments (yantras) for celestial movements, azimuth & altitude and also time. Originally built by the Maharaj Sawai Jai Singhji of Jaipur in 1710 it is still standing (restored 1910) and it is also listed as a UNESCO preservation site. One could still see the carefully carved measuring scales on the stones and each instrument had a plaque explaining for what celestial body was being measured (declination, time, etc). I did not linger long and left for our next stop.
One of the Yantras