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jdawe
Posts:
317
Registered:
11/8/09


Re: ActionReaction: Answering Questions, Solving Problems.
Posted:
May 19, 2013 10:33 PM


On May 20, 12:30 pm, Sam Wormley <sworml...@gmail.com> wrote: > On 5/19/13 9:19 PM, jdawe wrote: > > > See if you can measure the Earths rotation without linear grounding. > > Fifth graders can sight a prominent star with two sticks and time > the 360° rotation of the earth on the following night.
They must stick those sticks in the ground. Alternatively they must hold those sticks while standing vertically on the Earth.



