Measure the Earth's Radius with a Nothing but a Stopwatch and Meter stick! (PDF)

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Sun at solar maximum

ERN Item Type: 

  • Classroom Activities


Daryl Science


It is possible to measure the Earth's radius -- armed with only a stopwatch, a meter stick and a sunset or sunrise! Keep in mind; this is a demo, not a Fermi-like laboratory investigation. That said, this will yield surprisingly "accurate" results given the kids don't mess up on the two measurements they do have to take.

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