The gnomon is a right-angled triangle. The slanting side is at an angle of 28.4° to the ground, meant to match what was thought to be Delhi’s latitude in those days (it is taken as 28.7° today ...

The complex, dotted with other instruments, reflects the era’s thirst for understanding celestial mechanics. In Delhi, another Jantar Mantar shares the legacy of its Jaipur counterpart.