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Class 7
Chapter 8 Class 7 - Measurement of Time and Motion (Curiosity)

Samrat Yantra - The World's Largest Stone Sundial

Last updated at May 4, 2026 by

💡 Fascinating Fact - Samrat Yantra at Jantar Mantar

  • Samrat Yantra is the world's largest stone sundial.
  • It was built around 300 years ago at Jantar Mantar in Jaipur, Rajasthan.
  • Jantar Mantar is a UNESCO World Heritage site.
  • The sundial is 27 metres tall.
  • Its shadow moves at about 1 millimetre per second .
  • It can measure time intervals as short as 2 seconds .
  • It shows local solar time, which needs correction to get IST.
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