Jantar Mantar, in New Delhi, India, consists of 13 architectural astronomy instruments. Built by Maharaja Jai Singh II of Jaipur, from 1723 onwards, as he was given by Mughal emperor Muhammad Shah the task of revising the calendar and astronomical tables. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets.

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Keywords: architecture, archival, archive, astronomical, astronomy, calendar, delhi, emperor, historical, history, ii, india, instruments, islamic, jai, jaipur, jantar, maharaja, mantar, moon, mughal, muhammad, observatory, planets, science, shah, singh, sun, tables