New Delhi:

Jantar Mantar located in Connaught Place was built by Maharaja Jai Singh II of Jaipur. It consists of 13 architectural astronomy instruments. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". The Jantar Mantar consists of how many architectural astronomy instruments?
13