Located in one among the three islands in Fateh Sagar Lake, Udaipur Solar Observatory alias USO is the one and only Asian solar observatory, designed as per the model of Solar Observatory at Big Bear Lake in Southern California. Sprawl over an area of 1.2 sq. km, Udaipur Solar Observatory was established in the year 1975, by Dr. Arvind Bhatnagar under the Vedhashala Trust of Ahmedabad. From 1981, Udaipur Solar Observatory has been administered by Physical Research Laboratory (PRL), Ahmedabad for the Department of Space, Government of India. 

Udaipur Solar Observatory is considered as a perfect place to develop solar physics in India. Udaipur Solar Observatory is situated at the best of surroundings and climate for the solar observations. The air turbulence on island will be lesser than that on ground, as it is surrounded by water and therefore sharp images of sun can be obtained. Apart from this, other advantage of Udaipur Solar Observatory is that it is located in Rajasthan, which observes maximum number of cloudless days.

Udaipur Solar Observatory has got a wide variety of instruments including 'Solar Vector Magnetograph' for solar observation. Udaipur Solar Observatory has an international importance too as it is one of the six sites that includes in the Global Oscillations Network Group Network (GONG) in the World. Visitors can reach Udaipur Solar Observatory by taking a boat ride through Fateh Sagar lake. Udaipur Solar Observatory office building is situated at NW shore near Bari - Rani Road Junction.