The 'Jantar Mantar' observatories built by Jai Singh II incorporate architectural instruments for measuring time, predicting eclipses, and tracking celestial bodies.
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Answer: True
Jantar Mantar (Jaipur, Delhi, etc., 1724-1730) features massive stone instruments (samrat yantra, jai prakash) for astronomical observations. Combines Indian, Islamic, and European astronomical knowledge in architectural form.