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.

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.
Curriki Rating3

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.
Curriki Rating3

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
Curriki Rating3

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
Curriki Rating3

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

Curriki Rating3

Do NOT follow this link or you will be banned from the site!

Non-profit Tax ID # 203478467