These astronomical observatory are called Janter Mantar, Maharaja Jai Singh II of Jaipur constructed five Jantar Mantars in total, in New Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735.
In 1750 French astronomer Nicolas-Louis de Lacaille set up an observatory in Table Bay, Cape of Good Hope, where he did what?
Where is the W.M. Keck Observatory, a two-telescope astronomical observatory whose telescopes are among the largest optical/near-infrared instruments currently in use around the world?
