Anytime I hear sundials, I now think of my trip to Jantar Munter in Jaipur, India. Home to world's largest sundial, accurate to two seconds.

https://www.jantarmantar.org/learn/observatories/instruments...

Also home to many other instruments of measurement, absolutely fascinating.

https://en.m.wikipedia.org/wiki/Jantar_Mantar,_Jaipur