This folder contains a lesson, images, and assessment includes information on Eratosthenes, measuring the circumference of the Earth, and evidence that the Earth is round.

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Measuring the Earth

by Meredith Beaton

This lesson introduces students to the intuitive arguments for a spherical Earth, the observations and measurements by Eratosthenes, and the circumference of Earth. Students need to have background knowledge in ratios, proportions, and algebraic problem solving.
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This assessment asks students to reflect on the lesson "Measuring the Earth" and apply the things they've learned to solving the circumference of the Earth and reflecting on sources of error in this calculation.
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Earth's Shadow

by Meredith Beaton

The slightly circular shadow of the Earth cast on the moon during a lunar eclipse. License: CC-BY-SA; Luc Viatour; Source: http://commons.wikimedia.org/wiki/File:Eclipse_lune.jpg
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Ship on the Horizon

by Meredith Beaton

A ship that appears to be sinking into the ocean on the horizon due to the curvature of the Earth. License: CC-BY-SA; Anton Source: http://en.wikipedia.org/wiki/File:Shiphorp.jpg
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Eratosthenes Map

by Meredith Beaton

Map indicating locations of Alexandria, Syene, and Athens, for student reference. Original Image—World Map with Equator; Source: http://en.wikipedia.org/wiki/File:World_map_with_equator.jpg; License: GFDL, User:Cburnett Modified Image—Map showing Athens, Alexandria, and Syene; Source: own work; License: CC-BY-SA, Meredith Beaton
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