Built in 1731 to study the stars, Jantar Mantar became Delhi’s address for dissent. Now, Delhi Police have de-notified it as a protest venue, shifting all demonstrations to Ramlila Ground, Burari Ground and CBD Ground. As the Cockroach Janata Party demands a date to protest peacefully there, PTI looks back at how Boat Club curbs, a National Green Tribunal order and a 2018 Supreme Court ruling shaped its long story.