What happened (within the limits of the provided input)

The provided material frames Jantar Mantar (Janar Mantar) as a learning-oriented public heritage space and uses it to draw lessons for polity learning about how citizens understand shared public life through built environments.

Background: what Jantar Mantar is and why it can teach in public

Jantar Mantar consists of monumental astronomical instruments made of stone. These instruments are arranged in fixed, visible forms that support observation and systematic thinking about measurement and regularity in nature. Because the instruments sit in open public spaces where visitors can see and move around, the monument can act like an “open-air learning object” even without formal classroom instruction.

What changed now

The provided input does not contain extractable details like dates, named officials, administrative decisions, or legal instruments. Therefore, the note does not claim any concrete policy change tied to Jantar Mantar.