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Measuring the Earth

How to measure the Earth's diameter with a meter stick, a stopwatch, and some math.

Ted Bainbridge, Ph.D.
Date Accepted: 2015-11-20 Grade Group: High School (9-12) Benchmarks: M4.4.7 M5.4.2 M5.4.8 Keywords: algebra diameter earth equations geometry hands-on measurement proportion pythagoras radius rotation timing trigonometry sun proportionality Microsoft Word: 04_11_15_1.docx PDF Document: 04_11_15_1_4.pdf