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How Big Is the Earth?

In collaboration with another school north or south of yours, rnuse the method of Eratoshenes to determine the circumference rnof the Earth.

Grade Level: High School (9-12)
Curriculum Topic Benchmarks: M4.4.8, M5.4.12, M8.4.2, M8.4.15, S15.4.4, S16.4.1, S16.4.3
Subject Keywords: circumference, radius, Eratosthenes, gnomon, sun dial, Earth, noon, time zone, latitude, longitude, collaboration

Author(s): Stephen Edberg
PUMAS ID: 04_01_13_1
Date Received: 2013-04-01
Date Revised: 2013-11-19
Date Accepted: 2013-08-16

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