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Investigation 2 Part 1

Explore how observations of ships at sea provide evidence for the round shape of the Earth. Learn about Earth models, latitude and longitude, and historical observations. Contribute to the discussion on the best theory of Earth's shape.

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Investigation 2 Part 1

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  1. Investigation 2Part 1 Sailing ships

  2. Shape of earth • Okay, you all know that Earth is round – a sphere. But the more important question is, how do you know it is round?

  3. Earth models • Map • Globe • Features of both are drawn to the same scale

  4. Review latitude and longitude • Locate 0°, 0° (latitude and longitude) on the globe. What is there? • Find the site of Eratosthenes’s historical observation in Egypt, near where the Nile River crosses the tropic of Cancer. What is the latitude and longitude? • What is the global location of Reno, Nevada?

  5. Focus question • How do observations of ships at sea provide evidence of Earth’s shape? • DO NOT answer at this time.

  6. Sea voyages and observations • Get as close as possible to the starting point with your eyes. • Use notebook sheet 5 to record your observations.

  7. confirmation • https://www.fossweb.com/delegate/ssi-wdf-ucm-webContent/Contribution%20Folders/FOSS/multimedia/middle_school_html5_assets/Tutorials/earth_models/index.html

  8. Historical information • Observers from land saw a ship sink below the surface. • Sailors in the crow’s nest would see land minutes before the crew on deck would.

  9. Answer the focus question • Which theory of the shape of Earth is best confirmed by the observations of the two models of Earth? • Answer the focus question with that in mind.

  10. simulations • Is it possible to conduct every experiment or make every observation? Why or why not?

  11. Simulation • Round Earth • Sailing from the dock • View from land at sea level

  12. Review • What happens when you change your point of view?

  13. Horizon and line of sight • What is the horizon?

  14. Compare horizon • How is the horizon different for the flat Earth and the round Earth?

  15. Response sheet • Remember our simulations of Round Earth and Flat Earth.

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